Calorimetry

Calorimetry is a one apparatus that can measure the heat of chemical reaction or physical changes of the substance.
There are two types of calorimetry. First, indirect calorimetry calculates the heat of substance produces from their production of carbon dioxide and nitrogen waste, or from their consumptions of oxygen and direct calorimetry that the entire of substances is placed inside the calorimeter.
Calorimetry is performed using one of two methods, constant volume calorimetry or constant pressure calorimetry. In consants volume calorimetry, it performed in constant volume that involves the constant volume calorimeter. Because of no work performed, the heat measured equals to the internal energy of the system.