a) Define surface tension. (b) State two methods by which the surface tension of a...
PHYSICS
WAEC 2012
a) Define surface tension.
(b) State two methods by which the surface tension of a liquid can be reduced.
Explanation
(a) Surface tension is the force per unit length acting in the surface at right angles to one side of a line drawn in the surface of a liquid. It can be defined as the property of a liquid that makes it behave as if its surface is an elastic skin.
(b) Methods of reducing surface tension are by adding:
- Soap
- alcohol
- oil
- detergent
- increasing the temperature.
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