Surface Tension Calculator

Calculate surface tension, force, or length of the boundary.

Input Parameters

Force (F) (N)

Length (L) (m)

Calculation Results

Enter parameters to calculate

About this calculator

Quick Reference

γSurface tension

FForce exerted by the surface

LLength over which force acts

Overview

Surface tension is the tendency of liquid surfaces at rest to shrink into the minimum surface area possible.

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Pro Tips

The formula is γ = F / L.
The standard unit is N/m or J/m².
For a needle or ring on a liquid surface, the length L is usually twice the perimeter because there are two surfaces (interfaces).

Fun Facts

"Surface tension allows insects (like water striders), usually denser than water, to float and stride on the water surface."
"Soaps and detergents are 'surfactants' that lower the surface tension of water, allowing it to soak into fabrics more easily."
"Water has a very high surface tension (about 0.072 N/m at room temperature) because of the strong hydrogen bonds between its molecules."

Formula: γ = F / L