(physics) The energy needed to remove an electron from an atom or molecule to infinity

The Helmholtz free energy, A (the internal energy of a system minus the product of its entropy and absolute temperature)

(physics, chemistry, thermodynamics) The difference between the enthalpy of a system and the product of its entropy and absolute temperature: a measure of the useful work obtainable from a thermodynamic system at constant temperature and pressure.

(physics) The energy present in an object because of its mass

(physics) The radiant energy of the visible portion of a spectrum of light

(physics) The energy transmitted by radio-frequency electromagnetic radiation

The kinetic energy of a projectile at the point of emergence from the muzzle of a gun

(physics) The extra binding energy associated with pairs of nucleons of the same kind; this results in nuclei having odd numbers of protons or neutrons having a lower binding energy and being less stable (than those with even numbers)

(physics) The characteristic energy at which the amplitude of a system undergoing resonance is enhanced.

(physics) The energy released when two oppositely charged fragments of an atom or molecule recombine to form a neutral compound