Question

1. Define surface tension. Write formula, unit and dimension of surface tension.

Answer 1

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Surface tension is the ratio surface force of the liquid to the length on which the force acts.

$\boxed{\boxed{\gamma = \frac{F}{D}}}$

where,
γ  = Surface tension
F = Surface force
D = Length on which the force acts

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Answer 2

The liquid molecules which are below the surface are in equilibrium.  The liquid molecules which are at the surface are attracted by other molecules in downward direction. So, a force is originated to balance the surface molecules which is equal but opposite in direction to the downward force. This force is called surface tension.