Freeze drying

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Freeze drying is a dehydration process that specifically involves both low temperature and low pressure.

The result contains little to no moisture (the process [https://en.wikipedia.org/wiki/Sublimation_(phase_transition)

sublimated] it out), so that food (or other perishable) can be stored longer without freezing or milder refrigeration.

Freeze drying is also used for transport, since the removal of water also makes a product lighter.

Freeze-dried food often has a somewhat diminished flavour.