Question

Which physical quantity remain constant in both Boyle's and Charles law?​

Answer 1

Answer:

Statement

For a fixed mass of gas at constant temperature, the volume is inversely proportional to the pressure.

That means that, for example, if you double the pressure, you will halve the volume. If you increase the pressure 10 times, the volume will decrease 10 times.

You can express this mathematically as

pV = constant

Is this consistent with pV = nRT ?

You have a fixed mass of gas, so n (the number of moles) is constant.

R is always constant - it is called the gas constant.

Boyle's Law demands that temperature is constant as well.

That means that everything on the right-hand side of pV = nRT is constant, and so pV is constant - which is what we have just said is a result of Boyle's Law.