Barometers
Barometers - Related Videos
02:57
Definition and Measurement of Pressure: Atmospheric Pressure, Barometer, and Manometer
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2020
Gas pressure is caused by force exerted by gas molecules colliding with the surfaces of objects. Although the force of each collision is very small, any surface of an appreciable area experiences a large number of collisions in a short time, which can result in high pressure. In general, pressure is defined as the force exerted on a given area: Pressure is directly proportional to force and inversely proportional to area. Thus, pressure can be increased either by increasing the amount of...
04:31
Measurement of Metabolic Rate in Drosophila using Respirometry
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Cited by 49 •
2014
Metabolic disorders are among one of the most common diseases in humans. The genetically tractable model organism D. melanogaster can be used to identify novel genes that regulate metabolism. This paper describes a relatively simple method which allows studying the metabolic rate in flies by measuring their CO2 production.
05:54
Ideal Gas Law - Instructor Prep
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2020
Source: Smaa Koraym at Johns Hopkins University, MD, USA Preparation of the LaboratoryExpand Here, we show the laboratory preparation for 10 students working in pairs, with some excess. Please adjust quantities as needed. Put on a lab coat, splash-proof safety glasses or goggles, and appropriate gloves for the chemicals you will be handling. The day before the lab, place the Dumas tubes in an oven at 125 °C. Two hours before the lab, remove the tubes from the oven and...
12:18
Magnetic Resonance Elastography Methodology for the Evaluation of Tissue Engineered Construct Growth
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Cited by 16 •
2012
The procedure demonstrates the methodology of magnetic resonance elastography for monitoring the engineered outcome of adipose and osteogenic tissue engineered constructs through noninvasive local assessment of the mechanical properties using microscopic magnetic resonance elastography (μMRE).
11:44
Real-Time DC-dynamic Biasing Method for Switching Time Improvement in Severely Underdamped Fringing-field Electrostatic MEMS Actuators
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2014
The robust device design of fringing-field electrostatic MEMS actuators results in inherently low squeeze-film damping conditions and long settling times when performing switching operations using conventional step biasing. Real-time switching time improvement with DC-dynamic waveforms reduces the settling time of fringing-field MEMS actuators when transitioning between up-to-down and down-to-up states.
FAQs
A mercury barometer uses fluid statics: atmospheric pressure supports a mercury column, and the column’s measured level provides a quantitative pressure reading. This links an observable fluid arrangement with the weight of air above the location. In physics, the instrument demonstrates how pressure can be balanced and assessed through the behavior of a fluid.
An aneroid barometer responds through a sealed, flexible metal chamber. Changes in atmospheric pressure cause the chamber to expand or contract, and that mechanical change is used to report pressure. Unlike a mercury design, the aneroid approach does not depend on supporting a visible liquid column, providing a distinct example of how material deformation can indicate gas pressure.
Calibration establishes the relationship between a barometer’s physical response and the pressure value reported on its scale or display. For a mercury instrument, this connects the column measurement with pressure; for an aneroid or digital design, it relates chamber or sensor behavior to the reading. Calibration therefore makes measurements suitable for comparison and scientific interpretation.
Digital barometers combine electronic pressure sensors with data logging, allowing pressure readings to be recorded as a sequence rather than treated only as individual observations. Researchers can use these records to examine pressure changes and atmospheric dynamics. This capability also supports weather-related measurements when documenting how pressure behaves over an extended set of observations.
Barometer readings provide quantitative information about atmospheric pressure at a location. Those measurements support weather forecasting, help with altitude estimation, and contribute to studies of atmospheric dynamics. Their value extends beyond a single instrument reading because pressure data connect local observations with broader physical questions about the atmosphere and its changing behavior.
The three designs represent different measurement mechanisms. Mercury instruments show pressure through the behavior of a supported fluid column, aneroid instruments use expansion and contraction of a sealed flexible chamber, and digital instruments use electronic sensing with data logging. Comparing them helps illustrate fluid statics, gas behavior, mechanical response, and electronically recorded measurement within physics.