When suspended energy converts to energy in motion, we call this conversion . Energy stored in bonds between atoms is called potential energy. While in storage, the energy is potential energy. As the bonds break and the energy is transferred, it is called chemical energy. The amount of energy available for transfer is called energy. We can calculate the amount of energy available using the Free Energy Equation. This amount of energy is constant and does not change for a given reaction under set conditions. Some energy is lost to the environment during energy transfers. This unavailable energy increases as it is released.