First, I think you misspelled the word ebullient - meaning boiling, if u meant that then the answer is

Milk boils while heating because milk attain its boiling point. A liquid started to boil when its attain its boiling point 
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The word is ebullient. it means boiling.milk boils on heating as the kinetic energy of the particles increases on heating and reaches a certain point called boiling point. boiling point is the certain temperature at which the liquid starts boiling at its atmospheric pressure.
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