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Chemical composition of Italian Coffee knowledge Milk

Published: 2026-04-09 Author: World Gafei

Last Updated: 2026/04/09, Milk is made up of protein, fat and sugar. Protein is the medium of foaming, and when the air is pumped into the milk, the protein forms a thin film around the air, wrapping the air to form bubbles. Fat inhibits and destroys the foaming process, although whole milk produces softer foam than skim milk and unfortified milk

Milk is made up of protein, fat and sugar. Protein is a foaming agent. When air is pumped into milk, protein forms a thin film around the air, enveloping the air to form bubbles. Fat inhibits and disrupts the foaming process, although whole milk produces a softer foam than skim milk, and fortified milk froths more easily and expands to a larger volume than unfortified milk, which is why low-fat milk with added protein has a larger volume after foaming because it has more protein and less fat.

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