Chemistry
Milk is a colloidal system in which:

Fat is dispersed in water
Fat and water are dispersed in each other
Water is dispersed in fat
Fat is dissolved

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Chemistry
The main use of salt in the diet is to

ease the process of cooking
produce in small amounts the hydrochloric acid required for the digestion of food
increase the solubility of food particles in water
make the taste of food better

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