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Surface Tension

Surface Tension

Surface tension is defined as the force per unit length (γ) acting along the surface of a liquid. It arises due to strong intermolecular forces of attraction. A molecule located inside the bulk of the liquid is surrounded by other molecules and experiences equal forces in all directions. However, a molecule at the surface experiences unbalanced forces because there are more neighboring molecules below than above. This creates a net inward force that pulls surface molecules toward the interior,...

Surface Tension of Fluid

Surface Tension of Fluid

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 with...

Contact Angle

Contact Angle

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.
The adhesive force is the molecular force between molecules of different materials, that is, between the molecules of the solid and the liquid. The cohesive force...

Surface Tension, Capillary Action, and Viscosity

Surface Tension, Capillary Action, and Viscosity

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...

Comparing Intermolecular Forces: Melting Point, Boiling Point, and Miscibility

Comparing Intermolecular Forces: Melting Point, Boiling Point, and Miscibility

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.
Temporary attractive forces like dispersion are present in all molecules, whether they are polar or nonpolar. They...

Surface Tension and Surface Energy

Surface Tension and Surface Energy

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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Related Experiment Video

Updated: May 19, 2026

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

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

Published on: August 30, 2019

A molecular dynamics study to determine the solid-liquid interfacial tension using test area simulation method

Anjan R Nair¹, Sarith P Sathian

¹Computational Nanotechnology Lab, School of Nano Science and Technology, National Institute of Technology-Calicut, Kozhikode 673601, India.

The Journal of Chemical Physics

|September 4, 2012

Summary

This summary is machine-generated.

Molecular dynamics simulations reveal that solid-liquid interfacial tension differs between spherical nanoparticles and flat surfaces. This finding offers insights into heat transfer mechanisms at interfaces.

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Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces

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Published on: September 9, 2022

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Last Updated: May 19, 2026

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

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

Published on: August 30, 2019

Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces

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Published on: September 9, 2022

Area of Science:

Thermodynamics
Materials Science
Computational Physics

Background:

Molecular dynamics (MD) studies show anomalous heating above boiling point near nanoparticles, unlike flat surfaces.
Critical heat flux correlates with solid wetting characteristics, suggesting interfacial tension's importance.
Interfacial tension (or free energy) is a key factor in heat transfer mechanisms.

Purpose of the Study:

Determine and compare solid-liquid interfacial tension for planar and spherical interfaces.
Utilize the test area simulation method (TASM) within MD simulations.
Analyze the influence of interface geometry on interfacial tension.

Main Methods:

Employing molecular dynamics (MD) simulations.
Applying the test area simulation method (TASM) for interfacial tension calculation.
Comparing results for planar and spherical solid-liquid interfaces.

Main Results:

Spherical nanoparticle-fluid interfaces exhibit higher interfacial tension than flat surface-fluid interfaces.
Solid-liquid interfacial tension is dependent on nanoparticle size and temperature.
Observed differences in thermal transport are linked to interfacial tension variations.

Conclusions:

Interfacial tension is a critical parameter influencing heat transfer at solid-liquid interfaces.
Geometric effects (spherical vs. planar) significantly impact interfacial tension.
Results provide a basis for understanding nanoparticle-enhanced heat transfer phenomena.