Why dosen’t this happen with water ?
In: Chemistry
Although it does happen with all boiling, the effect is greater when the liquid contains molecules that stabilise bubbles so they last longer. In boiling water, the vapour bubbles burst as soon as they reach the surface. The proteins and fats in milk, the starch coming off rice and pasta, soap, and many others preserve the bubbles long enough so that they form a foam that doesn’t collapse before it reaches the top of the saucepan.
It does happen with water.
Just about everything out there expands when you heat it. Water expands when you heat it. Milk expands when you heat it.
Milk may expand more than water due to have more *stuff* in it, like fats and sugars.
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