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Measurement of Fluid Pressure

Measurement of Fluid Pressure

Fluid pressure is commonly measured using devices called manometers, which rely on liquid columns to indicate pressure differences. The height of a liquid column in a manometer reflects the pressure exerted by the fluid, providing a simple yet effective means of measurement. Different types of manometers serve specific purposes based on their configurations and the type of fluids involved.
A basic form of manometer is the piezometer, a vertical tube open at the top and filled with the same...

Definition and Measurement of Pressure: Atmospheric Pressure, Barometer, and Manometer

Definition and Measurement of Pressure: Atmospheric Pressure, Barometer, and Manometer

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.

Pressure Gauges

Pressure Gauges

Most pressure gauges, like those on scuba tanks, are calibrated to read zero at atmospheric pressure. Readings from such gauges are called the gauge pressure, which is the pressure relative to atmospheric pressure. When the pressure inside the tank exceeds atmospheric pressure, the gauge reports a positive value. Some gauges are designed to measure negative pressure. For example, many physics experiments must take place in a vacuum chamber, a rigid chamber from which some of the air is pumped...

Equipments Used To Measure Blood Pressure

Equipments Used To Measure Blood Pressure

Direct Method
This invasive approach involves cannulating a peripheral artery. During each cardiac contraction, pressure generates mechanical motion within the catheter, transmitted through rigid, fluid-filled tubing to a transducer. This transducer converts mechanical motion into electrical signals displayed as waveforms on a monitor. An automatic flushing system prevents blood backflow. Due to the potential risk of unexpected arterial blood loss, this method is primarily used in intensive...

Hydrostatic Pressure Force on a Plane Surface

Hydrostatic Pressure Force on a Plane Surface

When a plane surface is submerged in a fluid, hydrostatic forces develop on the surface due to the fluid's pressure. For horizontal surfaces, the pressure exerted by the fluid is uniform because the depth remains constant. The resultant force is determined by the pressure at the given depth multiplied by the area of the surface, and it acts through the centroid of the surface. For vertical surfaces, the pressure varies with depth, increasing as the distance from the fluid's free surface...

Variation of Atmospheric Pressure

Variation of Atmospheric Pressure

Change in atmospheric pressure with height is particularly interesting. The decrease in atmospheric pressure with increasing altitude is due to the decreasing gravitational force per unit area as we move away from the surface of the earth.
Assuming the air temperature is constant at a given altitude and that the ideal gas law of thermodynamics describes the atmosphere to a good approximation, one can find the variation of atmospheric pressure with height.
Let p(y) be the atmospheric pressure at...

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Updated: Jul 2, 2026

The Measurement of Unsteady Surface Pressure Using a Remote Microphone Probe

The Measurement of Unsteady Surface Pressure Using a Remote Microphone Probe

Published on: December 3, 2016

A new instrument for measuring surface pressure.

M Stenberg¹, H Löfgren

¹Research Laboratory of Electronics, Chalmers University of Technology, Gothenburg, Sweden.

The Review of Scientific Instruments

|September 1, 1979

Summary

This summary is machine-generated.

A novel instrument utilizes a floating-foil technique for precise surface pressure measurements at interfaces. This advanced tool offers high sensitivity and rapid response for studying interfacial phenomena.

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Area of Science:

Physical Chemistry
Materials Science
Surface Science

Background:

Interfacial tension measurements are crucial for understanding phenomena in various fields.
Existing techniques may have limitations in sensitivity, dynamic range, or response speed.

Purpose of the Study:

To develop and present a new instrument for accurate surface pressure measurements.
To characterize the performance of the novel floating-foil instrument.

Main Methods:

Construction of an instrument employing a floating-foil probe suspended at gas/liquid or liquid/liquid interfaces.
Utilizing the instrument to measure surface pressure with specified dynamic range and sensitivity.
Testing the instrument's response speed.

Main Results:

The instrument demonstrates a dynamic range of 0.1-70 mN/m.
Sensitivity is better than 0.1 mN/m, with a response speed of 50 ms.
Successful measurements were performed on behenic acid and cholesterol films on water, and a cerebroside film at a heptane/water interface.

Conclusions:

The developed floating-foil instrument is effective for precise surface pressure measurements.
The instrument's performance characteristics (range, sensitivity, speed) are suitable for various interfacial studies.
The presented measurements validate the instrument's capability in characterizing interfacial films.