First slide

Surface tension and surface energy

Question

If temperature increases, the surface tension of a liquid

Moderate

A

Increases
B

Decreases
C

Remains the same
D

Increases then decreases

Solution

As we increase the temperature of the liquid, the molecules have more kinetic energy. That means that they have more velocity. This decreases the attraction between the molecules of the liquid. As a result there is a net decrease in the surface tension of water as we increase its temperature.

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