Arrhenius' equation - Arrhenius' equation

Japanese: アレニウスの式 - アレニウスのしき（英語表記）Arrhenius' equation

This equation was proposed by Swedish chemist SA Arrhenius in 1889 as the relationship between the chemical reaction rate constant k and absolute temperature T , and is expressed as follows.

k = A exp ( -E / RT )

R is the gas constant, E is the height of the energy barrier that must be overcome for a reaction to occur, i.e., the activation energy, and A is the multiplicative product of the number of molecules that collide per unit time, z , and the steric factor P (the proportion of the number of molecules that collide from a direction that is suitable for the conditions to cause a reaction), expressed as A = Pz , and is called the frequency factor. This formula is widely applied to general chemical reactions such as homogeneous gas-phase or liquid-phase reactions, heterogeneous contact reactions and solid-state reactions, as well as dynamic phenomena such as viscosity and diffusion, except for high-speed reactions such as ionic reactions. (→Reaction rate)

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

スウェーデンの化学者 S. A.アレニウスが 1889年に化学反応速度定数 k と絶対温度 T との関係を表わす式として提出したもので，次のように表わされる。

k＝A exp (－E/RT)

R は気体定数，E は反応が起るためにこえるべきエネルギー壁の高さ，すなわち活性化エネルギーに相当し，A は単位時間に衝突する分子の数 z と，立体因子 P (衝突した分子のうち，反応を生じる条件に適した方向より衝突した分子の数の割合) との相乗積，すなわち A＝Pz で表わされ，頻度因子という。この式はイオン反応などの高速反応を除き，均一な気相や液相の反応，不均一な接触反応や固体反応など一般の化学反応，および粘性や拡散などの動力学的な現象にも広く適用される。 (→反応速度 )

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