What is the principle of calorimetry?

In calorimetry techniques, enthalpy changes accompanying physical or chemical events, whether they are exothermic or endothermic are measured and monitored either as a function of temperature or time. Thus calorimeter is able to collect a heat flux exchanged between the sample and the sensible part of the apparatus. 

The data gathered during a calorimetric experiment has within it much useful information about the reaction including the reaction kinetics and reaction thermodynamics, the reaction heat capacity change, enthalpy change, the entropy change, the equilibrium constant and the reaction mechanism.

The energy characteristics of a human body as a whole have been measured by direct and indirect calorimetry. In direct calorimetry, a human subject is put in a closed calorimetric chamber, and heat loss and in some cases various modes of energy flow are measured.

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