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Writer's pictureEvan Toh

When to use the concept PV = constant and P1V1 = P2V2 to solve?

Updated: 16 hours ago

When temperature is constant (for o-level), when a fixed mass of gas (fixed number of air molecules) is compressed in a closed system (e.g. piston), the volume V decreases and pressure P increases, and vice versa.


But when you multiply pressure and volume, PV, it is always a constant.

PV = constant


Hence we can always equate the PV of the first scenario = to the PV of the second scenario, provided there is no addition or removal of air molecules from the system.


Hence, you have P1V1 = P2V2


The followings are 4 different questions which require this concept to solve. Do revise them.


Question 01

Solutions: Option D (refer to the worked solutions below)


Question 02

Solutions: Option D

Question 03

Solutions: A


Question 04


Question 05

Solution: Option C



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