The gas laws

1 mark · Easy

Describe what happens to the volume of a gas if its pressure is doubled at constant temperature.

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The volume halves.

Also accept: The volume decreases to half its original value.

Common mistakes: Saying volume doubles instead of halves

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Marking points

B1 · 1 mark · States that volume halves (or decreases to half its value)

Worked solution

By Boyle's Law, pressure and volume are inversely proportional. If pressure is doubled, volume is halved.