Discussion
Assertion (A): Absolute pressure must be used in the ideal gas law.
Reason (R): The law is derived for a pressure measured from a true zero rather than from atmospheric pressure.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the cause. \( PV = nRT \) is derived on the assumption that pressure falls to zero when the molecules are absent, so it requires a pressure measured from that true zero. Substituting a gauge reading understates the pressure by one atmosphere - a small error at 50 bar and a very large one at 2, which is where it usually bites.
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