Discussion
Assertion (A): Drying calculations are done on a bone dry basis rather than a wet basis.
Reason (R): The mass of dry solid is unchanged through the drier while the total mass is not.
Answer: A
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 bone dry solid passes through unchanged, so it serves as a tie component and every stream can be referred to it. Working on a wet basis means both the numerator and the denominator change as water leaves, which makes the algebra needlessly awkward - and it is why moisture content in drying is quoted as kilograms of water per kilogram of dry solid.
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