What is the Unit of Surface Tension?

By BYJU'S Exam Prep

Updated on: September 13th, 2023

The unit of surface tension is the Newton per Meter or N/m. In general, liquids want to have as little surface area as feasible. The liquid’s surface resembles a thin, elastic sheet covering the smallest ground.

“Surface tension indicates the tension of the liquid’s surface layer resulting from the attraction of the liquid’s surface layer particles to its volume, which acquires the least amount of surface area feasible.”

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

How to Calculate 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. Surface tension is can be defined as,

T=F/L

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

What Causes Surface Tension?

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

Examples of Surface Tension:

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

• Floating a needle in water.
• Rainproof tent materials where the 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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