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I Wonder Why – Why Boiling Water Does Not Overflow?

To much heat

Why does boiling milk overflow, but boiling water does not?

● The major component of Milk is water (83%).  Its other constituents are protein 

(5%), sugar (5%) and fat (7%). 

● When heated, fat is lighter than water floats as a creamy layer on the top and 

water vapor in the form of steam bubbles is trapped under it.

● Further  heating  results  in  the  formation  of  more bubbles  These 

bubbles expand and lift the creamy layer, causing it to overflow.

● You can prevent the boiling over the problem by lowering the heat. 

● In the case of water, the steam bubbles breathe as they reach the surface. So boiling 

water does not overflow.