First slide

Surface tension

Question

A liquid drop at temperature T, isolated from its surroundings, breaks into a number of droplets. The temperature of the droplets will be:

Easy

A

equal to T
B

greater than T
C

less than T
D

either (a), (b) or (c) depending on the surface tension of the liquid.

Solution

The total surface area of the droplets is greater than that of the single drop. Hence, they have greater surface energy. This extra energy must be drawn from the internal energy of the drop.

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