Question

Why does a milk saucepan overflows when heated?

Answer 1

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Milk overflows when boiled for the first time because it contains entrapped air. The air expands on heating and tends to escape lifting the surface of milk. Once all the air is expelled, the boiling would be regular and smooth.

Answer 2

Answer:

1. Milk overflows when boiled for the first time because it contains entrapped air.
2. The air expands on heating and tends to escape lifting the surface of milk.
3. Once all the air is expelled, the boiling would be regular and smooth.