# Surface Tension

Written by Jerry Ratzlaff on . Posted in Properties

Surface tension is the energy or force at the surface of a liquid that holds it together.

## formula

$$\sigma = \frac {F} {l}$$

Where:

$$\sigma$$ (Greek symbol sigma) = surface tension

$$F$$ = force per unit length

$$l$$ = length of a surface ares that keep sliding side stationary