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  2. Helmholtz free energy - Wikipedia

    en.wikipedia.org/wiki/Helmholtz_free_energy

    Thermodynamics. In thermodynamics, the Helmholtz free energy (or Helmholtz energy) is a thermodynamic potential that measures the useful work obtainable from a closed thermodynamic system at a constant temperature ( isothermal ). The change in the Helmholtz energy during a process is equal to the maximum amount of work that the system can ...

  3. Energy - Wikipedia

    en.wikipedia.org/wiki/Energy

    In physics, energy (from Ancient Greek ἐνέργεια (enérgeia) 'activity') is the quantitative property that is transferred to a body or to a physical system, recognizable in the performance of work and in the form of heat and light. Energy is a conserved quantity —the law of conservation of energy states that energy can be converted in form, but not created or destroyed; matter and ...

  4. Form Energy - Wikipedia

    en.wikipedia.org/wiki/Form_Energy

    Form Energy is an American energy storage company focused on developing a new class of cost-effective, multi-day energy storage systems that will attempt to enable a reliable and fully-renewable electric grid year-round. Form Energy's first commercial product is a rechargeable iron-air battery capable of storing electricity for 100 hours at ...

  5. Energy–momentum relation - Wikipedia

    en.wikipedia.org/wiki/Energy–momentum_relation

    Appearance. hide. In physics, the energy–momentum relation, or relativistic dispersion relation, is the relativistic equation relating total energy (which is also called relativistic energy) to invariant mass (which is also called rest mass) and momentum. It is the extension of mass–energy equivalence for bodies or systems with non-zero ...

  6. Mass–energy equivalence - Wikipedia

    en.wikipedia.org/wiki/Mass–energy_equivalence

    In physics, mass–energy equivalence is the relationship between mass and energy in a system's rest frame, where the two quantities differ only by a multiplicative constant and the units of measurement. [1] [2] The principle is described by the physicist Albert Einstein 's formula: . [3] In a reference frame where the system is moving, its relativistic energy and relativistic mass (instead of ...

  7. Deuterium–tritium fusion - Wikipedia

    en.wikipedia.org/wiki/Deuterium–tritium_fusion

    Deuterium–tritium fusion (sometimes abbreviated D+T) is a type of nuclear fusion in which one deuterium nucleus fuses with one tritium nucleus, giving one helium nucleus, one free neutron, and 17.6 MeV of total energy coming from both the neutron and helium. It is the best known fusion reaction for fusion devices and in thermonuclear weapons .

  8. Separation energy - Wikipedia

    en.wikipedia.org/wiki/Separation_energy

    Nuclear physics. In nuclear physics, separation energy is the energy needed to remove one nucleon (or other specified particle or particles) from an atomic nucleus . The separation energy is different for each nuclide and particle to be removed. Values are stated as "neutron separation energy", "two-neutron separation energy", "proton ...

  9. Outline of energy - Wikipedia

    en.wikipedia.org/wiki/Outline_of_energy

    It is approximately the heat equivalent of burning 100 cubic feet (2.8 m 3) of natural gas (~105.5 MJ). Quad – unit of energy equal to 10 15 (a short-scale quadrillion) BTU. Foot-pound (ft·lbf or ft·lbf) – unit of mechanical work, or energy, although in scientific fields one commonly uses joule (~1.356 J).

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