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Freeze-drying

substances water items

Freeze-drying, or lyophilization, process that removes water from foods, drugs, and other substances, preserving the items for later use. Unlike other food-drying processes, the costly freeze-drying method freezes the items, then changes any frozen moisture into water vapor in refrigerated vacuum chambers. Freeze-dried substances retain most of their original characteristics, do not shrink, and are easily dissolvable.

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