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A gas with a volume of 2 L is allowed to expand to a volume of 10 L.
What happens to the pressure in the
container if the temperature remains constant?
Boyle's Law
volume ∝ 1/pressure
volume is inversely proportional to pressure...
in other words, one goes up, the other one goes down
in this case, the gas expands from 2 L to 10 L = volume goes up
therefore, the pressure has to go down