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(詳細はchemical kinetics, the pre-exponential factor or A factor is the pre-exponential constant in the Arrhenius equation, an empirical relationship between temperature and rate coefficient. It is usually designated by A when determined from experiment, while Z is usually left for collision frequency. For a first-order reaction, it has units of s−1. For that reason, it is often called frequency factor. The frequency factor, A, depends on how often molecules collide when all concentrations are 1 mol/L and on whether the molecules are properly oriented when they collide. Values of A for some reactions can be found in here. ==References== (IUPAC Gold Book definition of pre-exponential factor ) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Pre-exponential factor」の詳細全文を読む スポンサード リンク
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