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单词 free energy
释义 free energy
A measure of a system's ability to do work. The Gibbs free energy (or Gibbs function ), G, is defined by
G = H - TS
, where G is the energy liberated or absorbed in a reversible process at constant pressure and constant temperature (T), H is the enthalpy and S the entropy of the system. Changes in Gibbs free energy, ΔG, are useful in indicating the conditions under which a chemical reaction will occur. If ΔG is positive the reaction will only occur if energy is supplied to force it away from the equilibrium position (i.e. when
ΔG = 0
). If ΔG is negative the reaction will proceed spontaneously to equilibrium. It is named after Josiah Willard Gibbs.
The Helmholtz free energy (or Helmholtz function ), F, is defined by
F = U - TS
, where U is the internal energy. For a reversible isothermal process, ΔF represents the useful work available. It is named after H. L. F. von Helmholtz
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更新时间:2025/6/23 2:24:04