Question

How does surface tension of liquid vary with temperature

Answer 1

In general, surface tension decreases when temperature increases because cohesive forces decrease with an increase of molecular thermal activity. The influence of the surrounding environment is due to the adhesive action liquid molecules have at the interface.


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Answer 2

Answer: surface tension of liquid decreases with increase in temperature and vice versa

Explanation:

Surface tension is the net downward force acting on the surface of liquids due to the pulling of surface molecules by the molecules present beneath them.

It is due to cohesive nature of the molecules in which molecules attract other molecules of similar kind.

Effect of temperature: Surface tension decreases with increase in temperature as the forces among particles decrease due to increase in kinetic energy and thus the cohesive nature decreases and thus surface tension also decreases.