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Step-by-Step Tutorial
PRACTICAL WALKTHROUGH · PARAMETERS · COMMON MISTAKES
Freeze‑drying removes water by sublimation under low pressure, preserving food structure and nutrients.
Origin: NASA (1960s) — United States
See full technique reference →During freeze‑drying, ice crystals are formed at sub‑freezing temperatures, then sublimated under vacuum in primary drying, followed by secondary drying to remove bound water. Precise control of temperature and pressure is essential to avoid collapse, case‑hardening, or loss of volatile aromas.
Primary Reaction
Sublimation of ice to water vapor under vacuum
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