First slide

Surface tension and surface energy

Question

Two droplets merge with each other and forms a large droplet. In this process

Moderate

A

Energy is liberated
B

Energy is absorbed
C

Neither liberated nor absorbed
D

Some mass is converted into energy

Solution

When two droplets merge with each other, their surface energy decreases.
$W = T (ΔA) = (negative)$ i.e. energy is released.

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