Why does milk overflow when boiled, while water does not?

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Enjoying a movie and suddenly remembered that, you had kept milk to boil and it overflowed. But have you ever thought, why does milk overflow when boiled, while water does not?

Let's know,

When the milk is boiled, the water or moisture in it boils at 100°C which further becomes vapour. But it is trapped under the top creamy layer of milk.

So, the vapour tries to push out, spilling out the milk's top creamy layer. In case of water, when it is boiled, vapour freely evaporates.


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