Discussion
Assertion (A): Humidity is expressed per unit mass of dry air rather than of moist air.
Reason (R): The dry air passes through a humidifier or drier unchanged and so serves as a tie component.
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 advantage. The dry air passes through a humidifier, drier or cooler unchanged in quantity, so it serves as a tie component: expressing humidity per kilogram of dry air means the denominator is constant through the unit and only the numerator changes. Referring it to moist air would make both terms vary and the algebra needlessly awkward.
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