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Related Concept Videos

Characteristics of Fluids01:20

Characteristics of Fluids

When a force is applied parallel to the top surface of a solid, it resists the applied force due to the internal frictional forces between the layers of the solid known as shearing resistance. However, when the force is removed, the shearing forces restore the original shape of the solid. Other deformation forces also cause temporary changes in shape if the forces are not beyond a threshold magnitude. Solids tend to retain their shape, making the study of their rest and motion easier. Beyond...
Characteristics of Fluids01:31

Characteristics of Fluids

Fluids differ from solids primarily in their molecular structure and stress response. Solids have tightly packed molecules with strong intermolecular forces, maintaining their shape and resisting deformation. In contrast, fluids have molecules spaced farther apart with weaker forces, allowing them to flow and deform easily.
Fluids, which include both liquids and gases, are substances that deform continuously under shearing stress. For example, water and oil are liquids with molecules that can...
Density, Specific Weight, Specific Gravity and Compressibility of Fluid01:27

Density, Specific Weight, Specific Gravity and Compressibility of Fluid

Density, specific weight, specific gravity, and compressibility are fundamental properties of fluids. Density is the mass per unit volume, characterizing the mass of a fluid system. It influences buoyancy, pressure, flow dynamics, viscosity, thermal conductivity, and sound propagation. For instance, in pipeline design, accurate density measurements ensure that the pipeline can handle the fluid's mass.
Specific weight represents the weight per unit volume and is calculated by multiplying density...
Viscosity of Fluid01:19

Viscosity of Fluid

Viscosity measures the resistance a fluid offers to flow and deformation. It results from internal friction between layers of fluid moving relative to one another. Dynamic viscosity, denoted by the Greek letter mu (μ), quantifies the force needed to move one fluid layer over another. For Newtonian fluids like water and air, the relationship between the shearing stress and the rate of shearing strain is linear, meaning their viscosity remains constant regardless of the applied stress.
Pressure Variation in a Fluid at Rest01:11

Pressure Variation in a Fluid at Rest

In a fluid at rest, the pressure at any point beneath the fluid surface depends solely on the depth, not on the container's shape or size. This principle, known as hydrostatic pressure, arises because, in stationary fluids, there is no acceleration, meaning the forces within the fluid balance out. Only vertical forces, caused by the weight of the fluid above, contribute to pressure changes with depth.
When measuring pressure at two different levels within the fluid, the difference in pressure...
Fluid Pressure01:14

Fluid Pressure

In mechanical engineering, fluid pressure plays a critical role in designing systems that utilize liquid flow, such as hydraulic systems, pumps, and valves. When designing these systems, engineers must ensure they can withstand the forces created by fluid pressure to avoid damage or failure.
According to Pascal's law, a fluid at rest will generate equal pressure in all directions. This pressure is measured as a force per unit area, and its magnitude depends on the fluid's specific weight or...

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Related Experiment Video

Updated: Jul 9, 2026

Measurement of the Compressibility of Cell and Nucleus Based on Acoustofluidic Microdevice
09:06

Measurement of the Compressibility of Cell and Nucleus Based on Acoustofluidic Microdevice

Published on: July 14, 2022

Anisotropic compressibility in inhomogeneous fluids.

Marcello Sega1

  • 1Department of Chemical Engineering and Sargent Centre for Process Systems Engineering, University College London, Torrington Place, WC1E 7JE London, United Kingdom.

The Journal of Chemical Physics
|July 8, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method to measure directional compressibility at fluid interfaces. This approach quantifies interfacial softness and reveals how compression affects molecular packing differently in various directions.

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Experimental Measurement of Settling Velocity of Spherical Particles in Unconfined and Confined Surfactant-based Shear Thinning Viscoelastic Fluids
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Experimental Measurement of Settling Velocity of Spherical Particles in Unconfined and Confined Surfactant-based Shear Thinning Viscoelastic Fluids

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Last Updated: Jul 9, 2026

Measurement of the Compressibility of Cell and Nucleus Based on Acoustofluidic Microdevice
09:06

Measurement of the Compressibility of Cell and Nucleus Based on Acoustofluidic Microdevice

Published on: July 14, 2022

Experimental Measurement of Settling Velocity of Spherical Particles in Unconfined and Confined Surfactant-based Shear Thinning Viscoelastic Fluids
10:28

Experimental Measurement of Settling Velocity of Spherical Particles in Unconfined and Confined Surfactant-based Shear Thinning Viscoelastic Fluids

Published on: January 3, 2014

Area of Science:

  • Physical Chemistry
  • Materials Science
  • Fluid Dynamics

Background:

  • Compressibility is well-defined for bulk liquids but complex at fluid interfaces.
  • Interfacial compression can lead to anisotropic changes in molecular packing.

Purpose of the Study:

  • To introduce a linear-response approach for measuring directional mechanical response at fluid interfaces.
  • To quantify interfacial softness and directional compressive modes.

Main Methods:

  • Developed a linear-response theory for inhomogeneous fluids.
  • Applied fluctuation formulas to equilibrium molecular dynamics simulations.
  • Investigated the water/carbon tetrachloride interface.

Main Results:

  • The method distinguishes scalar (bulk-like) and deviatoric (anisotropic) components of compressibility.
  • The water/carbon tetrachloride interface exhibits strong local anisotropic response.
  • A positive scalar surface excess response was observed.

Conclusions:

  • The new method provides a practical way to analyze interfacial mechanical properties.
  • Interfacial softening significantly impacts the apparent compressibility of confined fluids.
  • Findings are relevant for understanding thin films and multilamellar vesicles.