During the constant rate period of drying of a solid ?
Correct answer: C. Surface evaporation of unbound moisture occurs
- A. Increased air humidity decreases the rate of drying
- B. Increasing the air temperature decreases the drying rate
- C. Surface evaporation of unbound moisture occurs
- D. None of these
Explanation
During the constant-rate period, evaporation occurs from a continuously wet surface, mainly involving unbound moisture. Higher air humidity lowers the vapor-pressure driving force, while higher temperature generally increases the drying rate.
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