1: Temperature
When the temperature of a liquid is increased the kinetic energy of its molecules is also increased. The inter-molecular distance increases lowering the cohesive force between the liquid molecules. Consequently the surface tension of the liquid is reduced.
2: Impurities
The presence of impurities in a liquid lowers its surface tension. Examples of impurities include kerosene and detergents like soap solution.
Githiari answered the question on October 12, 2017 at 14:08
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