Aakansha has made two paper cups by folding sheet of paper. She half fills one of the cups with water and keep the other empty. She put paper cups about the flame carefullywhich zone of the flame is best for heating.
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You will observe the one without water to start burning rapidly and the water boiling start with one with other.When the flame have transferred approximately 20,5 kJ of energy to the water ( if we assume at the water is at 4 degree C) it will reach 100 degree C and after the flame transferring additionally 113,000KJ of energy of the water,all the water have vaporized into steam and the paper mug will catch fire
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