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We know that we are very sensitive to hot, cold or any pain .At the early age we are able to know sensitivity of hot and cold. If we want to heat our room and cool our room we can use heater ,air cooler respectively. If a container is hot then we know that we have to wait to touch it.For test of ice-cream how much time we should wait to test it.These all are the example of heat in different form.
Change of energy from one form to another
If we put one hot body and other cold body together ,then after some time we will realize that the hotter body become cooler and cooler body will become hotter .After some time both the body will have the same temperature.In the world of physics this is known as movement of heat from a warmer object to a colder one .