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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

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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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Comparing Intermolecular Forces: Melting Point, Boiling Point, and Miscibility02:34

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Intermolecular forces are attractive forces that exist between molecules. They dictate several bulk properties, such as melting points, boiling points, and solubilities (miscibilities) of substances. Molar mass, molecular shape, and polarity affect the strength of different intermolecular forces, which influence the magnitude of physical properties across a family of molecules.
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Excess Pressure Inside a Drop and a Bubble01:13

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The shape of a small drop of liquid can be considered spherical, neglecting the effect of gravity. This drop can further be considered as two equal hemispherical drops put together due to surface tension. The forces acting on the spherical drop are due to the pressure of the liquid inside the drop, the pressure due to air outside the drop, and the force due to the surface tension acting on the two hemispherical drops.
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Intermolecular Forces and Physical Properties02:56

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Accurate Determination of the Equilibrium Surface Tension Values with Area Perturbation Tests
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Off-equilibrium surface tension in miscible fluids.

Domenico Truzzolillo1, Luca Cipelletti1

  • 1Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-Université de Montpellier, Montpellier, France. domenico.truzzolillo@umontpellier.

Soft Matter
|June 7, 2016
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Summary
This summary is machine-generated.

Physicists have experimentally confirmed an effective interface tension in miscible fluids, a phenomenon predicted over a century ago. This finding applies to various fluid systems, including liquids and complex solutions.

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Area of Science:

  • Fluid dynamics
  • Physical chemistry
  • Soft matter physics

Background:

  • Interfacial tension governs phenomena like droplet shape and insect locomotion on water.
  • D. Korteweg theorized effective interface tension in miscible fluids with composition gradients over 100 years ago.

Approach:

  • This mini-review synthesizes experimental evidence from recent decades.
  • Discusses diverse experimental strategies, highlighting their strengths and weaknesses.

Key Points:

  • Experimental work confirms a positive effective interface tension in miscible fluids.
  • This phenomenon is observed across various systems, from near-critical liquids to polymer solutions and colloidal suspensions.

Conclusions:

  • The existence of effective interface tension in miscible fluids is experimentally validated.
  • Open theoretical questions remain, necessitating further research into fluid behavior under composition gradients.