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The milk is a thick liquid (more viscous than water). When it boils the bubbles formed don't break as quickly as they do in water. This means more bubble form which take up room in the pot and this causes the milk to boil over. Water rises, too, just not as much since the bubble break more quickly.

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12y ago
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12y ago

Milk contains fat. When it reaches boiling temperature, the water at the top evaporates rapidly leaving behind a thin layer of fat. This fat seals the surface preventing water from evaporating. This water (steam) is collected under the film and forms a big bubble which enlarges as the milk continues to heat and pushes the surface to the top till it spills.

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Q: Why does milk rise when it boils?
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What happens to milk if it boils?

I don't know exactly how long it takes, but when it does boil it will also scorch the bottom of your pan. Generally a recipe will say "scald milk", and this means heat it only to the point of boiling then remove it from heat.


What happens when milk boils?

Milk boils out because - Milk is a colloid that has many substances suspended in it such as protein, sugar and fat. When milk is heated slowly the proteins and fat get separated. Since protein and fat are light they rise to the surface of the milk and collect together in the form of cream. Milk has a high content of water in it and when the milk is heated some of the water gets converted into vapor. Since the surface of the milk is covered by cream the vapor gets trapped below the cream layer. As the milk is heated the trapped water vapor expands and pushes against the layer of cream. The cream layer is lifted up as the water vapor expands and finally the pressure of the water vapor bursts through the cream layer and when this happens milk boils over and spills out. Water does not boil and spill out because - When water boils, bubbles form at the surface of water and burst. For water bubbles to expand further the temperature must be high enough so that the vapor pressure exceeds the atmospheric pressure or else the water vapor bubbles shrink and vanish.


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