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Measurement of Fluid Pressure01:16

Measurement of Fluid Pressure

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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...
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Related Experiment Video

Updated: Jan 6, 2026

Accurate Determination of the Equilibrium Surface Tension Values with Area Perturbation Tests
07:57

Accurate Determination of the Equilibrium Surface Tension Values with Area Perturbation Tests

Published on: August 30, 2019

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A simple levitated-drop tensiometer.

J Arcenegui-Troya1, A Belman-Martínez2, A A Castrejón-Pita1

  • 1Department of Engineering Science, University of Oxford, Oxford OX1 3PJ, United Kingdom.

The Review of Scientific Instruments
|October 3, 2019
PubMed
Summary
This summary is machine-generated.

This paper introduces a novel, cost-effective liquid tensiometer that uses ultrasonic waves to levitate and vibrate tiny liquid samples. This method accurately measures surface tension using minimal sample volumes and allows for sample recovery.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Analytical Chemistry

Background:

  • Surface tension measurement is crucial for understanding liquid behavior and interfacial phenomena.
  • Existing tensiometry methods can be complex, expensive, or require large sample volumes.

Purpose of the Study:

  • To develop a reliable, simple, and affordable liquid tensiometer.
  • To enable surface tension measurements with minimal sample volumes and rapid analysis.

Main Methods:

  • Utilized a tractor beam configuration with 72 ultrasonic transmitters to levitate micro-liter liquid droplets.
  • Induce controlled droplet vibrations via pressure instability for oscillation frequency detection.
  • Employed a photodiode and oscilloscope to record droplet oscillation signals.

Main Results:

  • Successfully measured effective surface tension by analyzing droplet oscillation frequencies.
  • Demonstrated operation with millisecond timescale analysis (t < 12.5 ms) and minimal liquid volumes (∼0.5 μl).
  • Validated the instrument's performance with diverse liquids including acetone, ethanol, Fluorinert FC-40, water, and whole milk.

Conclusions:

  • The developed ultrasonic levitation tensiometer offers a reliable, simple, and affordable method for surface tension determination.
  • The technique's low sample volume requirement and sample recoverability present significant advantages for various applications.