can you define calorimetry?

Calorimetry is the technique used for the measurement of energy changes associated with a chemical or a physical process.

The process of calorimetry is carried out in a vessel called the calorimeter, which is immersed in a known volume of a liquid.

To know about calorimeter and how energy changes are measured, please refer the study material "Calorimetry" in chapter " Thermodynamics". Animations are also available there for better understanding.