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Milk is centrifuged to separate the cream/fat.
No salt is added in the processing of milk. The process would be as follows: separation of cream and milk, adding back 1% milk fat, homogenisation and pasteurisation.
This is a physical change.
Preparation of cream from milk is a physical process.
what is a mechanical process that prevets cream from rising to the surface of milk?
what is a mechanical process that prevets cream from rising to the surface of milk?
Cream is the fatty parts of whole milk. You cannot churn milk to make cream but you can process whole natural milk to get the cream.
The amount of cream in milk means the cream content in the milk AFTER the pasteurisation process. The amount of cream in the milk is usually lower the more it is pasturized so it is put on the bottle to ensure you that, yes, there is cream still in the milk.
churning
Homogenization mixes the cream and the milk so they don't separate.
This process is called homogenisation. Cream is broken into tiny globules and distributed equally throughout the milk.
Substituting ingredients normally has a slight change on flavour or texture, but I often substitute milk for cream and vice versa with no ill effects. I wouldn't recommend using cream instead of milk in a drink if it was mainly milk, as the drink may end up too heavy. I wouldn't recommend using milk instead of cream in a cake filling, as the cake won't hold together.