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why does boiling milk come out?

As milk heats, the water in its structure starts evaporating from the surface. This concentrates the remaining fat and proteins into a thicker layer at the top of the pot. This layer eventually becomes so thick that water vapor rising through the milk can't break through very easily and gets trapped.

The layer is so uniform that you can't necessarily see what's boiling up right underneath, except in little bubbles around the edges.Enough water vapor eventually collects that it raises the thickened layer above it and breaks violently through and the milks spills over.


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