Discussion
Assertion (A): Hot air drying begins with heating the ambient air.
Reason (R): Heating raises the air's saturation vapour pressure without changing its humidity ratio.
Select the correct answer from the options below.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both statements are true and the reason explains the assertion. Heating raises the saturation vapour pressure steeply - roughly doubling every ten degrees in this range - while adding no water, so the humidity ratio is unchanged and the relative humidity falls sharply.
That drop in relative humidity is the drying potential. This is why hot air drying begins at the heater: it creates the vapour pressure difference between product and air that drives evaporation, without any of the water having to be supplied or removed beforehand.
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