# Principle of Calorimetry | Definition – Thermometry and Calorimetry

Calorimetry Physics Meaning:
This is the branch of heat transfer that deals with the measurement of heat. The heat is usually measured in calories or kilo calories.

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## Principle of Calorimetry | Definition – Thermometry and Calorimetry

Calorimetry is the science or act of measuring changes in state variables of a body for the purpose of deriving the heat transfer associated with changes of its state.

Principle of Calorimetry:
When a hot body is mixed with a cold body, then heat lost by hot body is equal to the heat gained by cold body.

Heat lost = Heat gain

i.e. principle of calorimetry follows the law of conservation of heat energy.

If two substances having masses m1 and m2, specific heats c1, and c2 kept at temperatures T1 and T2 (T1 >T2) are mixed, such that temperature of mixture at equilibrium is Tmix.
Then,
m1.c1(T1 – Tmix) = m2c2(Tmix – T2)

or

Tmix = $$\frac{m_{1} c_{1} T_{1}+m_{2} c_{2} T_{2}}{m_{1} c_{1}+m_{2} c_{2}}$$

Temperature of Mixture in Different Cases

Thermometry and Calorimetry:
The thermometer is a device used to check the temperature of an object. This branch of measurement of the temperature of a substance is called thermometry. It is measured in degrees or Fahrenheit, usually.

Calorimetry also means the measurement of heat but in joules. It states the amount of heat lost by the body is the amount of heat gained by its surrounding.