Food processing is the process that changes the nature of the raw materials into food products in appropriate conditions. And plophai per consumed as food preservation to lengthen shelf life freeze dehydration dehydration by freezing or lyophilization, it means the water ice crystals become, then pressure so that ice crystals by sublimation as the steam pressure to low.Over time, normal low temperature (the temperature is equal to or less than 0° c. Ice sublimation pressure equal to 4.7 mm of mercury or less), frozen food should be stored at a temperature no higher than-18 C to 20 C 0 or-0 is the best. Storing frozen food temperature (-18 0 C)-(-20 0 C) can be stored for a long time, 2 years in storage at low temperatures is to stop the reactions of a biochemical treatment of high quality texture without the ice crystals in the food is still the same small size. Tissue cells remain. Do not damage this food containers must be closed mitchit. Prevention of evaporation of water from the food storage of frozen food in the refrigerator, the first free House can hold up to 3 months.
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