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Related Concept Videos

Surface Tension of Fluid01:22

Surface Tension of Fluid

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Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
Surface tension varies...
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Surface Tension, Capillary Action, and Viscosity02:57

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Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
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Surface Tension and Surface Energy01:16

Surface Tension and Surface Energy

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When a paint brush is immersed in water, the bristles wave freely inside the water. When it is taken out, the bristles stick together. The reason behind this effect is surface tension.
Consider a beaker filled with liquid. The bulk molecules in the liquid experience equal attractive forces on all sides with the surrounding molecules. However, the surface molecules experience a net attractive force downward due to the bulk molecules. The surface of the liquid behaves like a stretched membrane,...
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Dry Friction01:30

Dry Friction

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Dry friction occurs between two solid surfaces in contact as they attempt to move relative to one another. In daily life, dry friction is encountered in various forms, such as when walking on the ground, sliding an object across a table, or rubbing hands together. Despite its ubiquity, the underlying mechanisms behind dry friction are not readily visible.
To illustrate this concept, imagine a wooden crate resting on a rough, non-uniform horizontal surface. When an external force is applied to...
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Frictional Force01:07

Frictional Force

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When a body is in motion, it encounters resistance because the body interacts with its surroundings. This resistance is known as friction, a common yet complex force whose behavior is still not completely understood. Friction opposes relative motion between systems in contact, but also allows us to move. Friction arises in part due to the roughness of surfaces in contact. For one object to move along a surface, it must rise to where the peaks of the surface can skip along the bottom of the...
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Contact Angle01:13

Contact Angle

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When a solid is dipped inside a liquid, the liquid surface becomes curved near the contact. For some solid–liquid interfaces, the liquid is pulled up along the solid, while for others, the liquid surface is convex or depressed near the solid surface. This phenomenon can be explained using the concept of cohesive and adhesive forces.
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Updated: Dec 15, 2025

Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces
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Surface Tensions between Active Fluids and Solid Interfaces: Bare vs Dressed.

R Zakine1, Y Zhao1,2, M Knežević3

  • 1Université Paris Diderot, Laboratoire Matière et Systèmes Complexes (MSC), UMR 7057 CNRS, F-75205 Paris, France.

Physical Review Letters
|July 9, 2020
PubMed
Summary
This summary is machine-generated.

Surface tension at active fluid-solid interfaces is complex, influenced by steady currents. Researchers developed methods to measure the "bare" surface tension, generalizing the Young-Laplace law for active systems.

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Area of Science:

  • Physics
  • Soft Matter Physics
  • Fluid Dynamics

Background:

  • Active fluids exhibit complex interfacial phenomena.
  • Understanding surface tension in active systems is crucial for various applications.
  • Existing models often simplify the behavior of active fluid interfaces.

Purpose of the Study:

  • To analyze surface tension at active fluid-solid interfaces.
  • To differentiate between intrinsic and setup-dependent contributions to interfacial forces.
  • To generalize the Young-Laplace law for active systems.

Main Methods:

  • Analysis of tangential forces at the fluid-solid interface.
  • Utilizing macroscopic experimental setups.
  • Employing a generalized virial formula for computation.

Main Results:

  • Surface tension comprises an equation-of-state part and setup-dependent contributions from steady currents.
  • Steady currents in active systems can obscure the intrinsic surface tension measurement.
  • A generalized Young-Laplace law applicable to active systems was derived.

Conclusions:

  • The study provides a framework for understanding and measuring surface tension in active fluids.
  • Direct measurement of "bare" surface tension is achievable with specific probes.
  • The findings offer new insights into the physics of active interfaces.