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6.7. Measurement of AU and AH: Calorimetry The experimental technique of, measuring energy changes accompanying any chemical process is called calorimetry. These measurements are generally carried out under two conditie PySical () at constant volume (4, or AU) 6.7.1. Measurement of AU Taking the example of enthalpy of combustion, the heat of combustion at constant volume. i energy change is measured experimentally using an apparatus called Bomb calorimeter, as shown n E Ir consists of a strong steel vessel (called bomb') which can stand high pressures. It is surrounded by a bigger vessel which contains water and is insulated. A thermometer and a stirrer are suspended in it. The procedure consists of the following two If T2