(chemistry) The net potential energy liberated or absorbed during the course of a chemical reaction

heat under the ground used to heat water and make steam to turn generator turbines and make electricity.

(physics) The energy needed to separate the constituent parts of an atom or nucleus; equivalent to the mass defect.

(physics) The energy released by a nuclear reaction; either through nuclear fission or nuclear fusion / Such energy used as a power source.

Energy in the form of electromagnetic radiation emitted from the Sun; especially that part of this energy that is converted into usable thermal or electrical energy by man.

(physics) The sum of the potential energy and kinetic energy of a body or system

The amount of energy, measured in calories, that a person uses (e.g. during a particular activity).

Energy in a form that can radiate, generally electromagnetic energy.

(physics) The conversion of one form of energy into another, or the movement of energy from one place to another.

(physics) A measure of the bending of ingoing and outgoing rays of light that are orthogonal to a 2-sphere surrounding a region of space whose mass is to be defined.