Question

Why a balloon which is half filled with water and put over a burning candle does not brust?

Answer 1

The reason a balloon filled with air pops when you put it over a flame is because the rubber of the balloon gets very hot and weak and then breaks. When you fill a balloon with water instead of air, the water absorbs most of the heat, so the rubber doesn't get very hot. Water has a very high heat capacity, much higher than air, so it will keep the balloon from bursting.

Answer 2

as it is consisted of water and anything that is consisted of water is never burned
e.g. put water in paper cone and try to burn it it will not burn