Discussion
A dry impermeable skin that forms on a rapidly dried surface and traps moisture within is called _____.
Answer: C
Correct answer: case hardening
Case hardening is the formation of a dry, impermeable skin when the surface dries far faster than moisture can arrive from the interior. The outer layer shrinks and its structure closes, sealing the remaining moisture inside.
Drying then appears to finish while the centre is still wet, and the product may spoil in store as that moisture redistributes. The remedy is a gentler start - lower temperature, slightly higher humidity, lower velocity - or intermittent drying with rest periods. Caking is particles sticking together, browning a chemical reaction, and scorching thermal damage.
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