During constant rate period, the rate of drying decreases with the______________________?
Correct answer: D. Both A. and B.
- A. Decrease in air temperature
- B. Increase in air humidity
- C. Neither A. nor B.
- D. Both A. and B.
Explanation
The constant-rate drying rate depends on the external heat and mass-transfer driving forces rather than the solid's moisture content. Lower air temperature and higher air humidity reduce these driving forces, so both changes decrease the rate.
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