by 
Ganesh
ANSWERS: 1
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When we boil the milk in normal vessel a scum like film of cogulated albumin, mineral salt such as calcium phosphate & fat globules forms. Milk also has water as one of its constituent, the water starts to boil & gets trapped in this film causing spill of the milk. But in milk cooker the milk is placed in a sort of hot bath of water.The heat is transferred from boiling water hot bath to milk,this avoids/lessens the agitated movement of the water molecule from milk thus spill over is saved, more over you always have the alarm in the form of whistle.
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