What is the Unit of Surface Tension?

By Manesh Singh|Updated : July 19th, 2022

Newton per Meter is the unit of surface tension. As per the definition of surface tension, it is the phenomenon that occurs when the surface of a liquid is in contact with another phase or liquid. Liquids generally tend to acquire the least surface area possible. The surface of the liquid behaves like an elastic sheet that covers the least area.

"Surface tension implies the tension of the surface layer of a liquid caused by the attraction of the particles of the surface layer by the volume of the liquid, which acquire the least surface area possible”.

We have provided below the surface tension of various liquids:

Liquid

Surface Tension (N/m)

Hydrogen

2.4

Helium

0.16

Water

0.072

Ethanol

22.0

Sodium Chloride

114

 

What Causes Surface Tension?

Intermolecular forces such as Van der Waals's forces cause surface tension to occur. This force draws the liquid particles together. The particles are pulled towards the rest of the liquid along the surface.

Surface tension is can be defined as,

T=F/L

The surface force ( F) ratio to the length (L) along which the force acts.

Summary:

What is the Unit of Surface Tension?

The SI unit of Surface Tension is measured in Newton per Meter or N/m, and the CGS Unit of Surface Tension is dyn/cm.

Examples of Surface Tension

We have provided below the various examples of surface tension. Let’s take a look.

  • Floating a needle in water.
  • Rainproof tent materials where surface tension of water will bridge the pore's intent
  • Surface tension disinfectants 
  • Clothes Cleaning detergent powder 
  • Washing clothes with cold water

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What is the Unit of Surface Tension FAQs

  • The SI unit of Surface Tension is Newton per Meter or N/m, and the CGS Unit of Surface Tension is dyn/cm. 

  • Surface tension is the phenomenon that occurs when the surface of a liquid is in contact with another phase or liquid. Liquids generally tend to acquire the least surface area possible. The surface of the liquid behaves like an elastic sheet that covers the least area.

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