According to conservation of energy, heat gained by one body is equal to heat lost by another body.
Heat energy lost by a hot body is not equal to heat energy gained by the surroundings.
Assertion: According to the principle of calorimetry: Heat gained by a cold body = Heat lost by a hot body.
Reason: Heat is a form of energy, so according to the law of conservation of energy, the energy cannot be created or destroyed and its sum total remains the same.
Heat energy lost by a hot body is equal to heat energy gained by the cold body. Which of the following option/options below is/are associated with the above statement?