Discussion
During the constant rate period of drying, water is removed
Answer: A
Correct answer: from a continuous film at the surface
In the constant rate period the surface is kept wet by water drawn from within faster than it can evaporate, so the piece behaves like a free water surface and the rate depends on the air conditions rather than on the ceramic. The particles are drawn closer together as that water leaves, which is why this is also the shrinkage period and the dangerous one.
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