Question

What are milk and its chemical composition

Answer 1

The principal constituents of milk are water, fat, proteins, lactose (milk sugar) and minerals (salts). Milk also contains trace amounts of other substances such as pigments, enzymes, vitamins, phospholipids (substances with fatlike properties), and gases.
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Answer 2

The Milk Composition section describes the chemical and physical properties and effects of pasteurization on the compounds in milk. A brief overview of the variation in milk composition is provided below as an introduction to this section. Topics covered are:

Carbohydrate (Lactose)
Fat
Protein
Vitamins and Minerals
Enzymes