Perishable food materials have very short shelf life under conditions. These food materials can be stored safely at low temperatures. Lowering of temperature helps in increasing their shelf-life due to the following reasons.
1.Low temperature slows down the growth of bacteria, yeast and moulds, and inhibits the action of enzymes present in the food material.
2.Low temperature helps the food materials to retain their nutritive value.
3.At homes the perishable food are stored in a refrigerator.
4.On commercial scale the perishable food are stored in cold storages. A deep freezer is a room-like cabinet maintained at low temperature by using the principle of refrigeration.
A cold storage is a godown-like large enclosure maintained at low temperature by large refrigeration machines.
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