Question

Why does milk in saucepan overflows when heated

Answer 1

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. A second boiling would not lead to overflow. Also, milk tends to froth when it boils

Answer 2

Answer:

Milk , when heated in a saucepan over flows because of the heat energy supplied to it , increases the interparticular movement of particles , ( i.e. kinetic energy) gas particles which tend to escape.