The equilibrium constant (K) is a temperature-dependent quantity that relates the equilibrium concentrations (Kc) or partial pressures (Kp) of the products and reactants of a reaction, each raised to its stoichiometric coefficient. Its value indicates how far a reaction proceeds towards products: a large K means products are favoured. K depends only on temperature, not on the initial amounts.

平衡常数(K)是与温度有关的量,它把反应中生成物与反应物的平衡浓度(Kc)或分压(Kp)按各自化学计量系数取幂后相联系。其数值表明反应朝生成物方向进行的程度:K 大表示有利于生成物。K 只取决于温度,而与初始量无关。