Energy is a physical quantity defined in the sciences, and may also refer to:

Nuclear energy, energy that is the consequence of decomposition or combination of atomic nuclei

In physics, entropy, symbolized by S, is a measure of the unavailability of a system’s energy to do work.[3] Entropy is central to the second law of thermodynamics and the combined law of thermodynamics, which deal with physical processes and whether...

Kinetic energy, the form of energy as a consequence of the motion of an object or its constituents

The vital element invoked in Vitalism, which is often referred to as "energy"

Bioenergetics, the study of energy changes in living systems.

Potential energy, the form of energy that is due to position of an object

Fuel is any material that is burnt or altered in order to obtain energy.[1] Fuel releases its energy either through chemical means, such as combustion, or nuclear means, such as nuclear fission or nuclear fusion. An important property of a useful fuel...

Gibbs free energy, a related concept in chemical thermodynamics that incorporates entropy considerations too

Dark energy, used to explain some cosmological phenomena

Electromagnetic energy, energy of radiations e.g. light

Binding energy, a concept explaining how the constituents of atoms or molecules are bound together

Food energy, energy in food that is available through digestion

Energy (band), a Taiwanese boy group

List of energy topics

Energy (society), energy resources, fuels, electricity and associated technologies

Mechanical energy, the potential energy and kinetic energy present in the components of a mechanical system.

"Energy", a song by The Apples in Stereo from New Magnetic Wonder

Internal energy, potential for a closed thermodynamic system held at constant entropy

KNRJ, Energy 92.7 & 101.1, Phoenix, Arizona

Energetics is the scientific study of energy flows and storages under transformation. Because energy flows at all scales, from the quantum level, to the biosphere and cosmos, energetics is therefore a very broad discipline, encompassing for example...

Energy (spirituality), invoked by spiritualists for alternative modes of healing the human body

KNGY, Energy 92.7, San Francisco, California

Stress-energy tensor

Elastic energy, which causes or is released by the elastic distortion of a solid or a fluid

Helmholtz free energy, a thermodynamic potential that measures the "useful" work obtainable from a closed thermodynamic system at a constant temperature, useful for studying explosive chemical reactions

Psychic energy, energy by which the work of the personality is performed

Blue energy, energy retrieved from the difference in the salt concentration between seawater and river water

NRJ Radio, a radio network in Paris, France

"Energy", a song in the LazyTown soundtrack

Energy, Illinois, a village in the United States

International Energy Agency

KBZD, Energy 99.7, Amarillo, Texas

Energy (album), the only full CD released by Operation Ivy

Energy (psychological), a psychological term used to describe the states of human mind

Bond energy, a measure of the strength of a chemical bond

Energy (signal processing), the energy Es of a continuous-time signal x(t)

"Energy", a song by The Pillows from Pantomime

Planck energy, 1.22 × 10¹⁹ GeV (billion electron volts)

Interaction energy, the contribution to the total energy that is a result of interaction between the objects being considered

Negative energy

Energy Rekords, a record label

Conventional energy: fossil fuel energy, nuclear power and hydraulic power.