O-LevelPhysicsThermal Physics5054/12 · Oct/Nov 2017 · Q131 Mark
A dish of liquid is left on a laboratory bench. Some of the liquid evaporates. What happens and why?
AThe liquid cools because liquid molecules have more potential energy than gas molecules.
BThe liquid cools because faster-moving molecules escape.
CThe liquid warms because liquid molecules have less potential energy than gas molecules.
DThe liquid warms because slower-moving molecules are left behind.
✓ Correct answer
B: The liquid cools because faster-moving molecules escape.
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