How many times have you seen milk boil and spill over, and wondered why this happens? To answer this question we have to know a little more about the composition of milk.
Unlike water, milk is not a simple liquid. Milk is an emulsion of fat and water(Milk contains about 87% of water). When you boil milk, the fat separates to the top and forms a layer on top. The water below boils and vaporizes to form steam, but is trapped by the layer of fat above.On further heating of milk, the water vapour expands and creates enough pressure to raise the thick creamy layer and escapes out causing the milk to spill down. In case of water, there is no such layer on its surface that traps water vapor. Hence the vapor keeps on escaping as soon as it is formed.
How we can prevent milk from spilling
It is very easy to prevent milk from spilling. All one has to do is to provide a path for the vapour to escape. For this we can keep a long-handled spoon in the milk container so that water vapour is able to escape along the handle of the spoon. This prevents the vapour from getting trapped under the layer of cream and thus spilling over of milk.
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