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1 Freeze drying or lyophilization is a drying method where the solvent is frozen prior to drying and is then sublimed, i.e., passed to the gas phase directly from the solid phase, below the melting point of the solvent.
3. Freeze-drying food requires a lot of energy. Freeze-drying is one of the most energy-intensive ways to preserve food, according to R. Paul Singh, a University of California-Davis food science and technology professor. Mountain House freeze-dries its food in 3,000-pound batches over a period of 18 to 20 hours.