a) Define surface tension.
(b) State two methods by which the surface tension of a liquid can be reduced.
(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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