On what factors does the value of surface tension depend? Explain.

(N/A) Surface tension is a property of a liquid that arises due to the cohesive forces between its molecules. The value of surface tension depends on the following factors:
$1$. Nature of the liquid: Different liquids have different cohesive forces between their molecules. For example,mercury has a higher surface tension than water.
$2$. Temperature: The surface tension of a liquid generally decreases as the temperature increases. This is because an increase in temperature increases the kinetic energy of the molecules,which weakens the cohesive forces.
$3$. Impurities: The presence of impurities can either increase or decrease the surface tension. Highly soluble substances (like salt) increase surface tension,while sparingly soluble substances (like soap or detergents) decrease it.