For Boyle's law to hold, the gas should be:

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(A) Boyle's law states that for a fixed mass of an ideal gas at a constant temperature, the pressure is inversely proportional to the volume ($P \prop

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Perfect and of constant mass and temperature

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(A) Boyle's law states that for a fixed mass of an ideal gas at a constant temperature, the pressure is inversely proportional to the volume ($P \propto 1/V$ or $PV = 	ext{constant}$).From the ideal gas equation, $PV = nRT$.For $PV$ to be constant, the number of moles $(n)$ must remain constant (fixed mass) and the temperature $(T)$ must remain constant.Additionally, Boyle's law is strictly applicable to ideal (perfect) gases.Therefore, the correct condition is that the gas must be perfect (ideal) and have constant mass and temperature.Thus, option $(A)$ is correct.

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