O-LevelPhysicsThermal Physics5054/12 · May/June 2021 · Q231 Mark
Air in a sealed container of fixed volume is heated. The pressure of the air increases. How do the molecules of air cause this increase in pressure?
AThe molecules expand and push on the container with a greater force.
BThe molecules move at the same speed and hit the container with a greater force.
CThe molecules move faster and hit the container more often.
DThe molecules move further apart and hit the container more often.
✓ Correct answer
C: The molecules move faster and hit the container more often.
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