The falling rate period in the drying of a solid is characterised by__________________?
Correct answer: B. Increasing temperatures both on the surface and within the solid
- A. Increase in rate of drying
- B. Increasing temperatures both on the surface and within the solid
- C. Decreasing temperatures
- D. None of these
Explanation
During the falling-rate period, the surface is no longer fully wet, so evaporation resistance increases and the surface and interior temperatures rise toward the drying-air temperature. The drying rate therefore decreases rather than increases.
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