When we touch with very heat water, we can't bear more than one minute in touch with the heat water, within few seconds we keep us away from the heat water, but when we touch with some heated water, then after sometime we feel its temperature is same but little over our body temperature. Why it happens? think...
I will tell you, when two bodies at different temperatures touch with each other, then after some time, they get intermediate temperature between the temperatures of two bodies because there is flow of heat from hot body to cold body, we can say it in another manner, i.e., the heat loss by hot body is equal to cold body. We called it as principle of mixtures.
Using this principle, we can find out specific heat experimentally. The important point to remember in this principle is it is applicable only when there is no external loss or gain to the system of cold and hot bodies.
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