A fully automatic digital bomb calorimeter is a sophisticated instrument used in chemistry laboratories for assessing the heat of combustion of a substance. This serves as the usual way it works sample preparation a small amount of the material for be tested usually available in of a pellet is weighed and placed into a crucible. Assembly the crucible containing the sample is placed inside a high, Pressure vessel known as along with, A bomb an excess of oxygen. Ignition the bomb is sealed, And an electrically heated wire igniter functions to initiate the combustion reaction. Measurement as the it releases, Substance burns heat, Which raises the heat level of the surrounding fluid contained in a calorimeter vessel. The increase in temperature is accurately measured using a sensitive thermometer or a thermistor.