It is icy to keep for milk to must guard against

It is icy to keep for milk to must guard against
Summary: When the milk is frozen, the free water is frozen first, the milk is frozen inwards gradually by outside, the dry material wrapped up inside is protein, fat, calcium,etc., the dry material is not frozen, lengthen with icy time, the dry material content inside increases correspondingly.
The milk will go bad under higher temperature, but will go bad to ice milk. It is reported, contain 3 kinds of water of different nature in the milk: Free water, combining water and water of crystallization. Among them free water content is the most, it will not bind with other materials, only plays an solvent role. It is a kind of water combined to combine water with protein, lactose, salt, no longer dissolve other materials, does not freeze under any circumstance. The third kind is water of crystallization, and water existing together with crystalline solid of lactose.
When the milk is frozen, the free water is frozen first, the milk is frozen inwards gradually by outside, the dry material wrapped up inside is protein, fat, calcium,etc., the dry material is not frozen, lengthen with icy time, the dry material content inside increases correspondingly.
After the milk is unfreezed, protein is apt to precipitate, solidify and go bad in the milk. So the milk avoids keeping icily!
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