Bomb calorimeters are used to test the calorific value of solid and liquid fuels, which are traded based on that value. Fuels such as coal and oil must meet regulations specifying the total calorific value, quality and purity of the fuel. Liquid fuels like gasoline and kerosene are also tested by bomb calorimetry. The measure of energy give-off by the fuel is determined by the fuel’s heat of combustion.