O-LevelPhysicsThermal Physics5054/12 · May/June 2018 · Q191 Mark
A sealed container of gas is heated and the pressure inside increases. What happens to the molecules of the gas to cause this increase in pressure?
ATheir kinetic energy decreases.
BThey become heavier.
CThey expand.
DThey hit the container more frequently.
✓ Correct answer
D: They hit the container more frequently.
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