(physics) a principle stating that energy may not be created or destroyed

plural of bundle of energy

(physics, quantum mechanics) The lowest possible energy of a given quantum mechanical system.

(physics, thermodynamics) A measure of the useful work obtainable from a constant temperature, constant volume thermodynamic system; more precisely, the difference between internal energy (of a system) and the product of its absolute temperature and entropy.

(chemistry, physics) The change in enthalpy that occurs when a specific chemical bond is broken; a measure of the strength of the bond

(physics) The energy associated with the turbulent part of the flow of a fluid

(physics) The energy due to the interaction of two spinning systems; the dot product of their spin angular momenta

(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.

(meteorology) The kinetic energy of the zonal wind at a specified latitude.

(physics) The energy needed to split an atomic nucleus into its component parts; equivalently, the energy value of bringing all the nucleons together.