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Energy

From Wikipedia, the free encyclopedia

The word energy is widely used in various spheres of life and many meanings are often ascribed to it. In general terms, the word describes natural processes or phenomena that involve a change.

Science and technology

• Energy (physics), the amount of work a physical system can do on another
• Law of conservation of energy, a physical law in natural sciences governing energy
• Energy forms, the forms in which energy can be defined
• Activation energy explains the differences in the speeds of various chemical reactions
• Energy transformation, relating to energy's changes from one form to another
• Energy (chemistry), the potential for substances to undergo transformations or transform other substances
• Energy (biology), the potential of organisms to undergo or cause a change in their form or function
• Energy (Earth science), the potential of various constituents of the planet Earth to influence one another
• Energy (cosmology), energy transformations in the universe beyond the planet Earth
• Potential energy, the form of energy that is due to position of an object
• Kinetic energy, the form of energy as a consequence of the motion of an object or its constituents
• Mechanical energy, the potential energy and kinetic energy present in the components of a mechanical system.
• Binding energy, a concept explaining how the constituents of atoms or molecules are bound together
• Bond energy, a measure of the strength of a chemical bond
• Nuclear energy, energy that is the consequence of decomposition of an atomic nucleus
• Gibbs free energy, a related concept in chemical thermodynamics that incorporates entropy considerations too
• 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
• Elastic energy, which causes or is released by the elastic distortion of a solid or a fluid
• Interaction energy, the contribution to the total energy that is a result of interaction between the objects being considered
• Internal energy, potential for a closed thermodynamic system held at constant entropy
• Negative energy
• Orders of magnitude (energy)
• Units of energy, joules, ergs, calories, etc.
• Dark energy, used to explain some cosmological phenomena
• Planck energy, 1.22 × 1019 GeV (billion electron volts)
• Energy quality, empirical experience of the characteristics of different energy forms as they flow and transform
• Energy density, amount of energy stored in a given system or region of space per unit volume, or per unit mass
• Energy flow, flow of energy in an ecosystem through food chains
• Energetics, the scientific study of energy flows under transformation
• Stress-energy tensor, the density and flux of energy and momentum in space-time; the source of the gravitational field in general relativity
• Energy (signal processing)
• Food energy, energy in food that is available through digestion

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