Calorific value of a fuel is defined as the quantity of heat evolved by the complete combustion of unit quantity of the fuel in air. Bomb calorimeter is a device used to determine the caloric value of a solid fuel. First step here is burning a known mass of the solid fuel completely in the presence of oxygen. Brass calorimeter and the surrounding water absorb the heat liberated. By using a sensitive thermometer, note the increase in temperature of water and the calorimeter. Now the calorific value of the solid fuel can be calculated by using the principle that the heat lost by the burning fuel is equal to the heat gained by the water and the brass calorimeter. The main components of a bomb calorimeter are steel bomb, graphite sample, ignition coil, sealing ring, water tank, gas inlet, needle valve, insulated jacket, stirrer, power supply and a thermometer.
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