Why Freeze-Dry? - How Freeze-Drying Works HowStuffWorks
Aug 22, 2002 Set it out in a hot, arid area, and the liquid water inside will evaporate: The heat gives the water molecules enough energy to break free of the liquid and become gas particles. Then you seal it in a container, and it stays dry. This is how manufacturers make dehydrated meals like powdered soup and baking mixes.
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