What is a Bomb Calorimeter?

A bomb calorimeter is an instrument used to measure the heat of a reaction. The vessel, or bomb, is surrounded by water and is sealed. When the particular fuel is heated, the air escapes and also heats the water. Then, the temperature of the water is checked and can determine the caloric content of the fuel. Basically, bomb calorimeters are used to find the calorie content of foods.