การทำแห้งแบบแช่เยือกแข็ง freeze dry

Drying dry the frozen freeze drying (dehydration) is.The frozen (freezing) by the water contained in food, change the status from the liquid into an ice crystal, then reduce pressure so that the crystalline ice sublimation. (Sublimation) as by pressure, under normal atmosphere.

Drying and freeze-drying the freeze dry. (Dehydration) with
a freeze (freezing) by the water that is in transition from a liquid diet to become the first ice crystals. Thus reducing the pressure to keep sublimation of ice 
(sublimation), with a reduced vapor pressure is lower than normal.

Frozen drying freeze dry is dry (dehydration)
(freezing) by freezing water in the food change the state from liquid to become ice crystals. Then lower the pressure to produce ice crystals sublimation)
.(sublimation) vapor by reducing the pressure under normal atmosphere.