Other Definitions
calorimetry (dict)
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CalorimetryCalorimetry is the science of measuring the heat of chemical reactions or physical changes. Calorimetry involves the use of a calorimeter. Constant-volume Constant-volume calorimetry is calorimetry performed at a constant volume. This involves the use of a constant-volume calorimeter. No work is performed in constant-volume calorimetry, so the heat measured equals the change in internal energy of the system. The equation for constant-volume calorimetry is: -
Since in constant-volume calorimetry pressure is not kept constant, the heat measured does not represent the enthalpy change. Constant-pressure Constant-pressure calorimetry is calorimetry performed at a constant pressure. This involves the use of a constant-pressure calorimeter. The heat measured equals the change in internal energy of the system minus the work performed: -
Since in constant-pressure calorimetry, pressure is kept constant, the heat measured represents the enthalpy change: -
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