Discussion
During the constant rate period of drying
Answer: C
Correct answer: Free water covers the surface throughout
The constant rate period lasts as long as a continuous film of free water covers the surface. Evaporation then behaves as it would from a free water surface, so the rate depends only on the external conditions - air temperature, humidity and velocity - and stays constant while moisture from within replenishes the surface as fast as it is lost.
The product temperature stays at the wet bulb temperature rather than rising, and internal moisture movement does not yet limit the process; that becomes controlling in the falling rate period, once the surface can no longer be kept wet.
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