When two bodies at different temperatures are placed in contact with each other or mixed with each other (liquid-in-liquid, solid-in-liquid), the heat will pass from the body at higher temperature to the body at lower temperature until both bodies reach a common temperature. This state is called as thermal equilibrium.
At this state:
Heat lost by one body = Heal gained by the other body
Heat lost by body 1 = Heat gained by body 2
One Calorie:
1 calorie is the quantity of heat required to raise the temperature of I gram of water by 1ºC.
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