Name: clinical percussion and body sound
Uploaded: 2023-04-30T06:41:12.000Z
Duration: 8 min 45 s
Channel: JoVE

K12 Standards

new-york-state-science-learning-standards

New York State Science Learning Standards

High School

Physical Science

HS. Energy

HS-PS3-2.

Percussion

1. Before the patient encounter
<ol>
	<li>Keep fingernails clean, groomed, and trimmed.</li>
	<li>Wash your hands with soap and water or apply topical disinfectant solution.</li>
	<li>Warm your hands as able (e.g., with warm water or by rubbing them together) before patient contact.</li>
</ol>
2. Components of the exam
In theory, percussion can be utilized on any part of the body, but it is clinically most useful in the examinations of the chest and abdomen. Refer to the individual videos for these regions to learn about how percussion is specifically utilized.
3. Indirect percussion
<ol>
	<li>Establish a pleximeter by placing the middle finger of your non-dominant hand firmly against the body surface being examined.</li>
	<li>Make sure the entire distal phalanx is in contact with the patient, but the rest of the fingers are not, and instead they are splayed out to avoid making contact with the patient, which could dampen the sound.</li>
	<li>Using a quick, relaxed, snapping motion from the wrist, strike the distal interphalangeal joint of the pleximeter finger with the tip of the middle finger on your dominant hand. This is the plexor finger. The plexor finger should be lifted rapidly to avoid dampening the sound.</li>
	<li>One should familiarize themselves with the different percussion notes (Table 1). Gas-filled structures sound louder with longer notes, while solid structures create quieter, shorter notes. Liquid notes are typically between the gas-filled and solid structure notes. There are five common terms used to describe percussion notes in the physical examination: tympanitic, hyperresonant, resonant, dull, and flat.
	<ol>
		<li>Percuss over the abdomen. Gas-filled areas reveal the loud, high-pitched tympanitic note, as is commonly found over the stomach.</li>
		<li>Percuss over the lungs. Normal lung tissue reveals a loud, low-pitched resonant note. Hyperresonance cannot be demonstrated on normal subjects, but it is found in lung diseases, such as emphysema or pneumothorax. It can be distinguished from resonance, because it is louder and lower-pitched.</li>
		<li>Percuss the liver span. The dull percussion note heard over the liver is medium in intensity and pitch. The margins can be identified by a change in note, since a resonant note of normal lung tissue can be heard superior to the liver, and a tympanitic (or sometimes less dull) note can be heard inferiorly, due to the bowels.</li>
		<li>A soft, high-pitched flat note is heard when the underlying tissue is dense, as is the case with pleural effusions or ascites. In a patient without these pathological processes, appreciate a flat note by percussing over the dense quadriceps muscles, though percussing in this location holds no clinical utility during a physical exam.</li>
	</ol>
	</li>
</ol>
<table border="1" fo:keep-together.within-page="1" fo:keep-with-next.within-page="always">
	<tbody>
		<tr>
			<td>Percussion note</td>
			<td>Pitch</td>
			<td>Intensity</td>
			<td>Duration</td>
			<td>Location (normal)</td>
			<td>Pathological example</td>
		</tr>
		<tr>
			<td>Tympanitic</td>
			<td>High</td>
			<td>Loud</td>
			<td>Longer</td>
			<td>Gastric bubble</td>
			<td>Large pneumothorax</td>
		</tr>
		<tr>
			<td>Resonant</td>
			<td>Low</td>
			<td>Loud</td>
			<td>Long</td>
			<td>Normal lung tissue</td>
			<td>Simple chronic bronchitis</td>
		</tr>
		<tr>
			<td>Hyperresonant</td>
			<td>Lower</td>
			<td>Very loud</td>
			<td>Longer</td>
			<td></td>
			<td>COPD, pneumothorax</td>
		</tr>
		<tr>
			<td>Dull</td>
			<td>Medium</td>
			<td>Medium</td>
			<td>Medium</td>
			<td>Liver</td>
			<td>Intra-abdominal tumors and masses, pneumonia</td>
		</tr>
		<tr>
			<td>Flat</td>
			<td>High</td>
			<td>Soft</td>
			<td>Short</td>
			<td>Thigh</td>
			<td>Pleural effusion</td>
		</tr>
	</tbody>
</table>
Table 1. Characteristics of different percussion notes.
<ol start="5">
	<li>Note the amount of vibration in the pleximeter finger. Gas-filled structures allow for more movement of the pleximeter finger than liquid or solid structures. The differences are subtle and require keen attention and practice to appreciate.</li>
	<li>Percuss at each point a few times in rapid succession to ensure consistency of notes before moving to the next spot.</li>
</ol>
4. Fist percussion
The maneuver can be performed directly against the patient&#39;s body, or indirectly with the examiner&#39;s non-plexor hand placed palm down on the patient&#39;s body wall, and the plexor fist striking the dorsum of the hand to attenuate the force of the blow. Direct or indirect percussion with the ulnar aspect of the examiner&#39;s fist is most commonly utilized to elicit tenderness originating from the kidneys, but can also be utilized to identify tenderness in other deep organs (e.g., the liver).
<ol>
	<li>Deliver a quick, firm blow to the area of interest (e.g., costo-vertebral angle) with the ulnar aspect of a hand flexed gently into a fist. The examiner&#39;s motion is brisk, with movement originating at the elbow.</li>
	<li>Use the same technique when searching for an area of tenderness. It is critical to deliver the right amount of force - enough to uncover tenderness in a patient with pathology, but not so much to cause undue discomfort or pain in a patient without disease.</li>
</ol>
5. Other factors affecting a percussion note
<ol>
	<li>Make sure percussion is done directly on the patient&#39;s skin. Any barrier between the examiner and the patient can alter findings in percussion. This is especially true regarding vibrations sensed by the pleximeter finger, which can be affected by clothing, gowns, and even examination gloves. If gloves are worn during this portion of the exam, the clinician must account for the difference in the way the percussion note feels on the pleximeter finger.</li>
	<li>Note that applying more pressure with the pleximeter finger can augment sounds. Inadequate pressure with the pleximeter finger can cause artificial dullness. Striking more forcefully with the plexor finger is rarely helpful, though striking too lightly can also lead to artificial dullness.</li>
	<li>Remember that percussion notes and vibrations on the pleximeter finger are impacted by subcutaneous fat, which dampens vibrations, leading to increased areas of dullness.</li>
	<li>When moving around the area of the body being percussed (e.g., to establish liver span), maintain a consistency in exam technique. Keep a stable amount of pressure with the pleximeter finger and force with the flexor finger. Continue to strike the pleximeter finger at the same spot, using the same part of the plexor finger.</li>
</ol>
<div class="chapter_text" id="script_0">
	Percussion is a commonly used clinical skill that is most useful in the examinations of the chest and abdomen. Simply stated, percussion refers to the striking of one object against another to produce sound.
	The discovery of percussion's usefulness in medicine dates back to the 1700s. In former years of this century, an Austrian innkeeper's son, named Leopold Auenbrugger, discovered that he could take inventory by tapping his father's beer barrels with his fingers. Then, in 1761, while practicing medicine, he applied this technique on his patients and published the first description of the diagnostic utility of percussion. However, his findings faded into obscurity until the French physician, Jean-Nicolas Corvisart, in 1808, rediscovered Auenbrugger's writings and used them to teach percussion to his medical students. Since then this technique has become an integral part of day-to-day clinical practice.
	This video will first illustrate the types of percussion and the commonly heard percussion notes. Then, we'll go over the procedure and considerations for performing this technique during a physical examination. 
</div>
<div class="chapter_text" id="script_1">
	There are several types of medical percussion techniques. The historic type is 'direct percussion' in which the plexor-that is the tapping finger-strikes directly against the patient's body, but this method is obsolete and is no longer employed in clinical practice. It has been supplanted by 'indirect percussion' in which the plexor finger strikes a pleximeter, which is typically the middle finger of the non-dominant hand placed against the patient's body. 
	The third type is the 'auscultatory percussion', which relies on using a stethoscope to discern differences in sounds created by the plexor finger. Auscultatory percussion is a commonly used alternative method to assess liver size using the 'liver scratch test'. With the stethoscope held over the patient's liver, the examiner gently scratches the patient's skin while listening for changes in sound quality as the plexor finger makes its way over the liver edge. 
	Another percussion technique is called the 'fist percussion', which is performed using the ulnar aspect of the plexor fist. Again, this can be performed either directly against the patient's body, or by using an indirect method in which the examiner's non-plexor hand is placed palm down on the patient's body wall and the plexor fist strikes the dorsum of the hand to attenuate the force of the blow. Here, the examiner's motion should be brisk with movement originating at the elbow, and it is critical to deliver the right amount of force-enough to uncover tenderness in a patient with pathology, but not so much to cause undue discomfort or pain in a patient without any disease. 
</div>
<div class="chapter_text" id="script_2">
	Now, let's talk about the notes normally heard while performing indirect percussion. The percussion notes differ in relative intensity, pitch, and duration depending on the density of the underlying structure.
	A tympanitic sound is loud, high-pitched, and longer in duration than other sounds. It is normally heard over parts of the gastrointestinal tract that contain air, such as the stomach. A resonant note is also loud, but low-pitched, and long in duration. It is normally heard over the lung tissue. A dull note is medium in intensity, pitch and duration, and it appears over solid organs like the liver. A flat percussion note is soft, high-pitched, short and therefore hard to listen to. This note can be appreciated by percussing over the extremely dense quadriceps muscles, but percussing in this location holds no clinical utility. However, if a flat note is heard over the lungs, it may indicate pleural effusion, and if heard over a protruded abdomen it may indicate ascites. Another pathological percussion sound is hyperresonance, which, as compared to the resonant sound, is louder in intensity, lower in pitch and longer in duration. Hyperresonant sounds on lung percussion may indicate pneumothorax or chronic obstructive pulmonary disorder. 
</div>
<div class="chapter_text" id="script_3">
	Now that you know about the types of notes heard during indirect percussion, let's briefly review the general steps for performing this technique. Before starting with the exam, make sure that your fingernails are clean, groomed, and trimmed. Wash your hands with soap and water, or apply topical disinfectant solution. Warm your hands with warm water or by rubbing them together before patient contact.
	To percuss, place the pleximeter finger firmly against the body surface being examined. Make sure the entire distal phalanx is in contact with the patient, but the rest of the fingers should be splayed out to avoid making contact, as this could dampen the sound. With the tip of the plexor, strike the distal interphalangeal joint of the pleximeter using a quick, relaxed, snapping motion from the wrist. After the strike, lift plexor finger rapidly to avoid sound dampening.
	In addition to the sounds, note the amount of vibration in the pleximeter. The differences in vibration are subtle and require keen attention and practice to appreciate. The gas-filled structures might lead to more movement of the pleximeter finger, whereas the solid or liquid-filled regions may cause decreased vibration. During any physical exam, percuss at each point a few times in rapid succession to ensure consistency of notes before moving to the next spot.
</div>
<div class="chapter_text" id="script_4">
	In addition to performing percussion accurately, one must also pay attention to a few other factors that might affect the percussion notes. 
	Make sure percussion is done directly on the patient's skin. Performing percussion on the patient with clothing on is impermissible. While the use of gloves might be necessary for infection control purposes, in cases where gloves are necessary, the clinician must account for the difference in the way the percussion note will "feel" on the pleximeter finger, because the vibrations will feel different. 
	Note that the pressure applied with the pleximeter finger affects the percussion note. Inadequate pressure can cause artificial dullness, and more pressure can augment the sound. Also, the force with which the plexor strikes may affect the interpretation of one's findings. Striking more forcefully with the plexor finger is rarely helpful, though striking too lightly can also lead to artificial dullness. Remember that the percussion notes and vibrations are also impacted by the subcutaneous fat, which, if excess, may dampen the movement of the pleximeter. Finally, when examining a particular area of the body, maintain a consistency in the technique. To optimally compare sounds from one region to another, keep the amount of pressure with the pleximeter finger, the force with the plexor, the strike spot, and the part of the plexor finger used, all the same throughout the exam.
</div>
<div class="chapter_text" id="script_5">
	You've just watched JoVE's video on percussion performed during a physical examination. This presentation covered the types of percussion procedures, the commonly witnessed percussion notes, the technique and factors that may affect the findings of this procedure. Percussion revolutionized bedside diagnostics in the eighteenth and nineteenth centuries and it still remains an important method that enables clinicians to evaluate deep anatomic structures that cannot be visually inspected. As always, thanks for watching!
</div>

This video covers the general considerations related to percussion during the physical examination. The routine incorporation of percussion into the physical examination revolutionized bedside diagnostics in the eighteenth and nineteenth centuries, and it still holds high value in the detection of common thoracic and abdominal pathology, such as hepatomegaly, splenomegaly, pleural effusion, pneumothorax, and ascites. An understanding of the positioning, pressure, and movements required by the plexor and pleximeter finger...

percussion

Source: <a href="https://www.jove.com/author/Jaideep+S._Talwalkar">Jaideep S. Talwalkar</a>, MD, Internal Medicine and Pediatrics, Yale School of Medicine, New Haven, CT
Simply stated, percussion refers to the striking of one object against another to produce sound. In the early 1700s, an Austrian inn-keeper&#39;s son, named Leopold Auenbrugger, discovered that he could take inventory by tapping his father&#39;s beer barrels with his fingers. Years later, while practicing medicine in Vienna, he applied this technique to his patients and published the first description of the diagnostic utility of percussion in 1761. His findings faded into obscurity until the prominent French physician Jean-Nicolas Corvisart rediscovered his writings in 1808, during an era in which great attention was focused on diagnostic accuracy at the bedside.1
There are three types of percussion. Auenbrugger and Corvisart relied on direct percussion, in which the plexor (i.e. tapping) finger strikes directly against the patient&#39;s body. An indirect method is used more commonly today. In indirect percussion, the plexor finger strikes a pleximeter, which is typically the middle finger of the non-dominant hand placed against the patient&#39;s body. As the examiner&#39;s finger strikes the pleximeter (or directly against the surface of the patient&#39;s body), sound waves are generated. If using indirect percussion, important information is gained from the vibration in the pleximeter finger, as well.2 The third type of percussion, auscultatory percussion, relies on the clinician using a stethoscope to discern differences in sounds created by the plexor finger.
The density of the structure underlying the site of percussion determines the tone of the percussion note; the denser the structure, the quieter the note. Notes differ in relative intensity, pitch, and duration, and help the examiner determine what lies below the skin surface. Knowledge of what particular locations on the body should sound like, in conjunction with the particulars of a specific clinical situation, can help a clinician determine if percussion notes in a particular patient are normal or not.

Source: Jaideep S. Talwalkar, MD, Internal Medicine and Pediatrics, Yale School of Medicine, New Haven, CT
Simply stated, percussion refers to the ...

Percussion is a commonly used clinical skill that is most useful in the examinations of the chest and abdomen. Simply stated, percussion refers to the striking of one object against another to produce sound.The discovery of percussion's usefulness in medicine dates back to the 1700s. In former years of this century, an Austrian innkeeper's son, named Leopold Auenbrugger, discovered that he could take inventory by tapping his father's beer barrels with his fingers. Then, in 1761, while practicing medicine, he applied this technique on his patients and published the first description of the diagnostic utility of percussion. However, his findings faded into obscurity until the French physician, Jean-Nicolas Corvisart, in 1808, rediscovered Auenbrugger's writings and used them to teach percussion to his medical students. Since then this technique has become an integral part of day-to-day clinical practice.This video will first illustrate the types of percussion and the commonly heard percussion notes. Then, we'll go over the procedure and considerations for performing this technique during a physical examination. There are several types of medical percussion techniques. The historic type is 'direct percussion' in which the plexor-that is the tapping finger-strikes directly against the patient's body, but this method is obsolete and is no longer employed in clinical practice. It has been supplanted by 'indirect percussion' in which the plexor finger strikes a pleximeter, which is typically the middle finger of the non-dominant hand placed against the patient's body. The third type is the 'auscultatory percussion', which relies on using a stethoscope to discern differences in sounds created by the plexor finger. Auscultatory percussion is a commonly used alternative method to assess liver size using the 'liver scratch test'. With the stethoscope held over the patient's liver, the examiner gently scratches the patient's skin while listening for changes in sound quality as the plexor finger makes its way over the liver edge. Another percussion technique is called the 'fist percussion', which is performed using the ulnar aspect of the plexor fist. Again, this can be performed either directly against the patient's body, or by using an indirect method in which the examiner's non-plexor hand is placed palm down on the patient's body wall and the plexor fist strikes the dorsum of the hand to attenuate the force of the blow. Here, the examiner's motion should be brisk with movement originating at the elbow, and it is critical to deliver the right amount of force-enough to uncover tenderness in a patient with pathology, but not so much to cause undue discomfort or pain in a patient without any disease. Now, let's talk about the notes normally heard while performing indirect percussion. The percussion notes differ in relative intensity, pitch, and duration depending on the density of the underlying structure.A tympanitic sound is loud, high-pitched, and longer in duration than other sounds. It is normally heard over parts of the gastrointestinal tract that contain air, such as the stomach. A resonant note is also loud, but low-pitched, and long in duration. It is normally heard over the lung tissue. A dull note is medium in intensity, pitch and duration, and it appears over solid organs like the liver. A flat percussion note is soft, high-pitched, short and therefore hard to listen to. This note can be appreciated by percussing over the extremely dense quadriceps muscles, but percussing in this location holds no clinical utility. However, if a flat note is heard over the lungs, it may indicate pleural effusion, and if heard over a protruded abdomen it may indicate ascites. Another pathological percussion sound is hyperresonance, which, as compared to the resonant sound, is louder in intensity, lower in pitch and longer in duration. Hyperresonant sounds on lung percussion may indicate pneumothorax or chronic obstructive pulmonary disorder. Now that you know about the types of notes heard during indirect percussion, let's briefly review the general steps for performing this technique. Before starting with the exam, make sure that your fingernails are clean, groomed, and trimmed. Wash your hands with soap and water, or apply topical disinfectant solution. Warm your hands with warm water or by rubbing them together before patient contact.To percuss, place the pleximeter finger firmly against the body surface being examined. Make sure the entire distal phalanx is in contact with the patient, but the rest of the fingers should be splayed out to avoid making contact, as this could dampen the sound. With the tip of the plexor, strike the distal interphalangeal joint of the pleximeter using a quick, relaxed, snapping motion from the wrist. After the strike, lift plexor finger rapidly to avoid sound dampening.In addition to the sounds, note the amount of vibration in the pleximeter. The differences in vibration are subtle and require keen attention and practice to appreciate. The gas-filled structures might lead to more movement of the pleximeter finger, whereas the solid or liquid-filled regions may cause decreased vibration. During any physical exam, percuss at each point a few times in rapid succession to ensure consistency of notes before moving to the next spot.In addition to performing percussion accurately, one must also pay attention to a few other factors that might affect the percussion notes. Make sure percussion is done directly on the patient's skin. Performing percussion on the patient with clothing on is impermissible. While the use of gloves might be necessary for infection control purposes, in cases where gloves are necessary, the clinician must account for the difference in the way the percussion note will "feel" on the pleximeter finger, because the vibrations will feel different. Note that the pressure applied with the pleximeter finger affects the percussion note. Inadequate pressure can cause artificial dullness, and more pressure can augment the sound. Also, the force with which the plexor strikes may affect the interpretation of one's findings. Striking more forcefully with the plexor finger is rarely helpful, though striking too lightly can also lead to artificial dullness. Remember that the percussion notes and vibrations are also impacted by the subcutaneous fat, which, if excess, may dampen the movement of the pleximeter. Finally, when examining a particular area of the body, maintain a consistency in the technique. To optimally compare sounds from one region to another, keep the amount of pressure with the pleximeter finger, the force with the plexor, the strike spot, and the part of the plexor finger used, all the same throughout the exam.You've just watched JoVE's video on percussion performed during a physical examination. This presentation covered the types of percussion procedures, the commonly witnessed percussion notes, the technique and factors that may affect the findings of this procedure. Percussion revolutionized bedside diagnostics in the eighteenth and nineteenth centuries and it still remains an important method that enables clinicians to evaluate deep anatomic structures that cannot be visually inspected. As always, thanks for watching!

Education

JoVE Science Education

Clinical Skills

Physical Examinations I

clinical percussion and body sound

Clinical percussion uses tapping to create sound and help assess what lies beneath the body surface. It is a simple bedside technique that depends on the way sound changes when it travels through different tissues. The method began with Leopold Auenbrugger, an Austrian inn-keeper's son, who found that tapping beer barrels could help him take inventory. He later applied the same idea to patients in Vienna and published the first description of its diagnostic use in 1761. Jean-Nicolas Corvisart later brought renewed attention to Auenbrugger's work in 1808, when careful bedside diagnosis was especially valued.

There are three forms of percussion. Direct percussion was used by Auenbrugger and Corvisart, and it means the plexor, or tapping finger, strikes directly on the patient's body. Indirect percussion is used more often today. In this method, the plexor finger taps the pleximeter, usually the middle finger of the non-dominant hand placed on the body. The vibration in the pleximeter finger also helps provide information.

A third form is auscultatory percussion. In this method, the clinician uses a stethoscope to hear differences in the sounds made by the tapping finger. The note that is heard depends on the density of the structure below the skin. Denser tissue makes a quieter note. Percussion notes can also vary in intensity, pitch, and duration. These differences help the examiner infer what is underneath and decide whether the sound is normal in a given clinical situation.

Clinical Percussion and Body Sound

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Clinical percussion uses tapping to create sound and help assess what lies beneath the body surface. It is a simple bedside technique that depends on the way sound changes when it travels through different tissues. The method began with Leopold Auenbrugger, an Austrian inn-keeper's son, who found that tapping beer barrels could help him take inventory. He later applied the same idea to patients in Vienna and published the first description of its diagnostic use in 1761. Jean-Nicolas Corvisart...

auscultation

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physical examinations i

This collection provides a foundation for performing physical exams; with techniques ranging from measuring blood pressure or vital signs, to key pulmonary and cardiovascular physical examinations. 

Learn how clinical percussion uses direct, indirect, and auscultatory methods to judge body sound and tissue density at the bedside.

Clinical Percussion and Body Sound | JoVE K12

HS. Waves and Electromagnetic Radiation

HS-PS4-5.

Life Science

Structure and Function

HS-LS1-3.

Jaideep Talwalkar

Internal Medicine

Yale School of Medicine

Overview

Types of Percussion

Indirect Percussion Notes

Indirect Percussion Steps

Factors Affecting Percussion Notes

Summary

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First Law of Thermodynamics

Energy Conservation

Energy can be converted from one form into another, but all of the energy present before a change occurs always exists in some form ...

Internal Energy

The total of all possible kinds of energy present in a substance is called the internal energy (U), sometimes symbolized as E. Suppose a system with ...

Enthalpy

Chemists ordinarily use a property known as enthalpy (H) to describe the thermodynamics of chemical and physical processes. Enthalpy is defined as the sum ...

Types of Potential Energy

Potential energy is also known as energy at rest or stored energy. Common types of potential energy include the gravitational potential energy stored in ...

Types of Kinetic Energy

The amount of kinetic energy of an object depends on its mass and speed. Consider two balls of different masses rolling down an inclined plane at the same ...

Kinetic Energy - I

It&#8217;s plausible to suppose that the greater the velocity of a body, the greater effect it could have on other bodies. This does not depend on the ...

Kinetic Energy - II

The kinetic energy of a particle is one-half of the product of the particle&#8217;s mass and the square of its speed. Note that just as Newton&#8217;s ...

Work-energy Theorem

According to Newton&#x2019;s second law of motion, the sum of all the forces acting on a particle (net force) determines the rate of change in the ...

Work and Energy for Variable Forces

When an object is acted upon by a variable force, the amount of work done and the change in energy of the object can be more complex to calculate compared ...

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Work-Energy Theorem for Motion Along a Curve

The work-energy theorem can be generalized to the motion of a particle along any curved path. The simple argument here is that the curved path can be ...

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Electric Potential Energy

When an electric field accelerates a free positive charge q, it is given kinetic energy. The process is analogous to an object accelerated by a ...

electric-potential-energy-in-a-uniform-electric-field

Electric Potential Energy in a Uniform Electric Field

When an electric field accelerates a free positive charge, it acquires kinetic energy. This process is analogous to an object being accelerated by a ...

Energy In A Magnetic Field

If a magnetic field is sustained, there must be a current in a closed circuit or loop, implying some energy has been spent in creating the field. If this ...

conservation-of-energy-approach-to-system-analysis

Conservation of Energy Approach to System Analysis

Source: Ricardo Mejia-Alvarez and Hussam Hikmat Jabbar, Department of Mechanical Engineering, Michigan State University, East Lansing, MI
The purpose of ...

Thermodynamic Systems

A thermodynamic system is a set of objects whose thermodynamic properties are of interest. The system is considered to be embedded in its surroundings or ...

using-differential-scanning-calorimetry-to-measure-changes-in-enthalpy

Using Differential Scanning Calorimetry to Measure Changes in Enthalpy

Source: Laboratory of Dr. Terry Tritt &#8212; Clemson University
Differential Scanning Calorimetry (DSC) is a method of thermodynamic analysis based on ...

Create a computational model to calculate the change in the energy of one component in a system when the change in energy of the other component(s) and energy flows in and out of the system are known.

HS-PS3-1.

Conservation of Energy

The terms &#39;conserved quantity&#39;&#160;and &#39;conservation law&#39;&#160;have specific scientific meanings in physics, which differ from the ...

Conservation of Energy: Application

When solving problems using the energy conservation law, the object (system) to be studied should first be identified. Often, in applications of energy ...

force-and-potential-energy-in-one-dimension

Force and Potential Energy in One Dimension

Force can be calculated from the expression for potential energy, which is a function of position. The component of a conservative force, in a particular ...

force-and-potential-energy-in-three-dimensions

Force and Potential Energy in Three Dimensions

Consider a particle moving under the action of a conservative force that has components along each coordinate axis. Each component of force is a function ...

Energy Diagrams - I

The dynamics of a mechanical system can be easily understood by interpreting a potential energy diagram. Since energy is a scalar quantity, the ...

Energy Diagrams - II

Energy diagrams are important to understand the dynamics of a system. The topology of an energy diagram helps illustrate the equilibrium points of the ...

Gravitational Potential Energy

Potential energy is not just a property of each object, but also a property of the interactions between objects in a chosen system. For each type of ...

Elastic Potential Energy

Elastic potential energy is the energy stored as a result of the deformation of an elastic object, such as the stretching of a spring. An object is ...

Abdominal Exam II: Percussion

Source: Alexander Goldfarb, MD, Assistant Professor of Medicine, Beth Israel Deaconess Medical Center, MA
Medical percussion is based on the difference in ...

Auscultation

Source: Jaideep S. Talwalkar, MD, Internal Medicine and Pediatrics, Yale School of Medicine, New Haven, CT
Through auscultation, the clinician is able ...

Cyclic Voltammetry (CV)

Source: Laboratory of Dr. Kayla Green &#8212; Texas Christian University
A Cyclic Voltammetry (CV) experiment involves the scan of a range of potential ...

Ear Exam

Source: Richard Glickman-Simon, MD, Assistant Professor, Department of Public Health and Community Medicine, Tufts University School of Medicine, MA
This ...

electrochemical-measurements-supported-catalysts-using

Electrochemical Measurements of Supported Catalysts Using a Potentiostat/Galvanostat

Source: Laboratory of Dr. Yuriy Rom&#225;n &#8212; Massachusetts Institute of Technology
A potentiostat/galvanostat (often referred to as simply a ...

Develop and use models to illustrate that energy at the macroscopic scale can be accounted for as a combination of energy associated with the motions of particles (objects) and energy associated with the relative position of particles (objects).

Conservation of Mechanical Energy

The mechanical energy E of a system is the sum of its potential energy U and the kinetic energy K of the objects within it. What happens to this ...

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Work Done on a System by External Force

The work done by an external force on a particle changes its kinetic energy. However, internal forces must also be considered for a system of interacting ...

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The internal energy of a thermodynamic system is the sum of the kinetic and potential energies of all the molecules or entities in the system. The kinetic ...

Quantifying Heat

Thermal Energy&#160;

Microscopically, thermal energy is the kinetic energy associated with the random motion of atoms and molecules. Temperature is a ...

Quantifying Work

As a system undergoes a change, its internal energy can change, and energy can be transferred from the system to the surroundings, or from the ...

A change in the internal energy of a system depends on the the net heat transfer into the system and the net work done by the system. The first law of ...

Cyclic Processes And Isolated Systems

A thermodynamic system with zero heat exchange and work is an isolated system. For these systems, the internal energy remains constant.
In the case of a ...

Isothermal Processes

A thermodynamic process that occurs at constant temperature is called an isothermal process. Heat slowly flows into the system or out of the system to ...

Isochoric and Isobaric Processes

A thermodynamic process that occurs at constant volume is called an isochoric process. According to the first law of thermodynamics, heat supplied or ...

Heat Capacities of an Ideal Gas I

Heat capacity is the ratio of heat absorbed by the substance corresponding to its temperature change. It is also called thermal capacity and the SI unit ...

Heat Capacities of an Ideal Gas II

For a system that undergoes a thermodynamic process at a constant volume condition, the heat absorbed is used only to increase the system&#39;s internal ...

Heat Capacities of an Ideal Gas III

The number of independent ways a gas molecule can move along straight line, rotate, and vibrate is called its degrees of freedom. Supposing d represents ...

Adiabatic Processes for an Ideal Gas

When an ideal gas is compressed adiabatically, that is, without adding heat, work is done on it, and its temperature increases. In an adiabatic expansion, ...

pressure-and-volume-in-an-adiabatic-process

Pressure and Volume in an Adiabatic Process

Free expansion of a gas is an adiabatic process. However, there are few differences between free expansion and adiabatic expansion. During free expansion, ...

Work Done in an Adiabatic Process

Consider the adiabatic compression of an ideal gas in the cylinder of an automobile diesel engine. The gasoline vapor is injected into the cylinder of an ...

Reversible and Irreversible Processes

The thermodynamic processes can be classified into reversible and irreversible processes. The processes that can be restored to their initial state are ...

Heat Engines

A heat engine is a device used to extract heat from a source and then convert it into mechanical work used for various applications. For example, a steam ...

fmri-functional-magnetic-resonance-imaging

fMRI: Functional Magnetic Resonance Imaging

Functional magnetic resonance imaging (fMRI) is a non-invasive neuroimaging technique used to investigate human brain function and cognition in both ...

Design, build, and refine a device that works within given constraints to convert one form of energy into another form of energy.

HS-PS3-3.

Refrigerators and Heat Pumps

Refrigerators or heat pumps are heat engines operating in a reverse direction. For a refrigerator, the focus is on removing heat from a specific area, ...

Plan and conduct an investigation to provide evidence that the transfer of thermal energy when two components of different temperature are combined within a closed system results in a more uniform energy distribution among the components in the system (second law of thermodynamics).

HS-PS3-4.

Clinical Percussion and Body Sound

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