What is the principle of method of mixtures

1. What is the principle of method of mixtures?
2. What is the other name given to it?
3. Name the law on which the principle is based?

Answer

1. According to principle of mixtures Heat lost by a hot body is always equal to the heat gained by a cold body provided no heat is lost to the surroundings.
2. Principle of Calorimetry
3. Law of conservation of energy