First slide

Surface tension and surface energy

Question

Which of the following statements are true in case when two water drops coalesce and make a bigger drop

Moderate

A

Energy is released
B

Energy is absorbed
C

The surface area of the bigger drop is greater than the sum of the surface areas of both the drops
D

The surface area of the bigger drop is equal to the sum of the surface areas of both the drops

Solution

When two water drops coalesce, the surface energy decreases and the surface area of the bigger drop is smaller than the sum of surface area of the two smaller drops

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