Final answer:
A bomb calorimeter is used to measure the heat transferred by a reaction under constant volume. The reactant is placed in a steel cup inside a steel vessel with a fixed volume, and the temperature increase is measured to calculate the heat released.
Step-by-step explanation:
The device shown is a bomb calorimeter that's used to measure the heat transferred by a reaction under constant volume. The reactant is placed in a steel cup inside a steel vessel with a fixed volume (the 'bomb'). The bomb is sealed, filled with excess oxygen gas, and placed inside an insulated container that holds a known amount of water. The temperature increase is then measured, and with the known heat capacity of the bomb and the mass of water, the heat released can be calculated.