Peak Flow Meter
Peak Flow Meter - Related Videos
09:28
Using a pH Meter
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2023
Source: Laboratory of Dr. Zhongqi He - United States Department of Agriculture Acids and bases are substances capable of donating protons (H+) and hydroxide ions (OH-), respectively. They are two extremes that describe chemicals. Mixing acids and bases can cancel out or neutralize their extreme effects. A substance that is neither acidic nor basic is neutral. The values of proton concentration ([H+]) for most solutions are inconveniently small and difficult to compare so that a more practical...
17:31
Operant Learning of Drosophila at the Torque Meter
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Cited by 25 •
2008
Measuring the yaw torque of tethered Drosophila with the torque meter allows the neuroscientist exquisite control of the stimulus situation of the experimental animal. Together with the unique genetic tools available in the fruit fly, this paradigm is used for a wide variety of neurobiological research.
01:20
IR Spectrum Peak Intensity: Dipole Moment
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2024
The dipole moment of a bond is the product of the partial charge on either atom and the distance between them. Dipole moments influence the efficiency of IR absorption and the peak intensity. When a bond with a dipole moment is placed in an electric field, the direction of the field determines if the bond is compressed or stretched. Electromagnetic radiation consists of an electric field component that rapidly reverses direction. It follows that polar bonds are alternately stretched and...
00:55
IR Spectrum Peak Intensity: Amount of IR-Active Bonds
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2024
When infrared radiation is passed through a molecule, absorption occurs if the molecule's vibration leads to a substantial change in its bond dipole moment. Transitions between vibrational energy levels, typically corresponding to infrared frequencies (4000–400 cm−1), allow absorption if the vibration significantly alters the dipole moment, making the molecule infrared active. The molecular bonds have different stretching and bending vibrations, resulting in various peaks with varying...
01:23
IR Spectrum Peak Broadening: Hydrogen Bonding
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2024
The vibrational frequency of a bond is directly proportional to its bond strength. As a result, stronger bonds vibrate at higher frequencies, while weaker bonds vibrate at lower frequencies. The stretching vibration of the strong O–H bond in alcohols and phenols (very dilute solution or gas phase) appears as a sharp peak at 3600–3650 cm−1. However, the extent of hydrogen bonding influences the observed stretching frequency and band broadening. Intermolecular or intramolecular hydrogen bonding...
FAQs
The indicator translates the patient’s fastest forced exhalation into a value in liters per minute. Interpreting that value in relation to repeated measurements helps clinicians assess whether airflow is remaining stable or changing. In this way, the device provides a practical measure for tracking airway obstruction over time, rather than relying on a single observation.
Establishing a personal best creates an individual reference point for later readings. Because airflow can be measured repeatedly, the patient or clinician can compare a new result with that benchmark and recognize meaningful change in airway function. This comparison supports ongoing monitoring, especially when the goal is to detect worsening airflow limitation rather than evaluate one isolated result.
Comparing readings over time can show whether airway function changes after treatment. An improving pattern may indicate better airflow, whereas a declining pattern may signal worsening limitation. The device therefore adds an objective airflow measure to clinical follow-up, helping clinicians assess response alongside the patient’s continuing measurements.
To obtain a reading, the patient inhales fully and then exhales as forcefully as possible through the mouthpiece. That effort drives the internal indicator to a value, which is recorded in liters per minute. Repeating the measurement over time allows the recorded results to be compared and used to track changes in airway function.
In asthma care, serial readings can help patients and clinicians recognize changes in airflow that may accompany worsening airway obstruction. Comparing current results with the person’s established measurements supports monitoring during routine care and can prompt timely consideration of further care when airflow becomes concerning.
Changing results provide information about whether airway function is stable or becoming more limited. Clinicians can use this pattern, together with the patient’s monitoring history, to identify possible worsening airflow limitation and evaluate whether further care should be considered. The value lies in supporting timely decisions, not in treating the number as an isolated finding.