Why does milk overflow when boiled but water does not? 

We see different substances having different densities in our daily life. Similarly, some liquid contains various constituent particles in it. The density of normal water is slightly less than the density of the milk.

 Here, we are going to discuss about why milk overflows when boiled but water does not.

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Composition of Milk

Milk contains water, fat, protein, carbohydrate, minerals, etc as its constituent particles. The average composition of milk is given as: 87% of water, 4% of fat, 3.4% of protein, 4.8% of lactose (carbohydrate), 0.8% of mineral and so on.

Pure water does not contain any such particles in it.

When we heat the milk, the milk and its constituent particles (fat, protein, etc) get separated and remain at the top as they are lighter than the milk. These floating fats and proteins form a creamy film layer at the top.

The water vapour gets trapped below this film. On increasing the temperature, more vapour pressure is created between the film and milk. Finally, the vapour pressure will be enough to the milk to overflow. After overflow of milk, second boiling would not lead to overflow.

Once all the vapour escape out, boiling will be regular like of water. In water, the formation of such layer does not occur, so that, it does not overflow.

Why is breastfeeding done in small doses at a time?

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There is also presence of trapped air in mother’s milk, which is the main cause of pain for babies. This pain is known as Colic Pain. Therefore, breastfeeding should be done in small doses at a time.

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