# RGT rule

The RGT rule ( R eaktions g eschwindigkeit- T emperature control, even van 't Hoff-rule ) is a rule of thumb, the chemical kinetics , allowing the estimation of many phenomena of chemistry , biochemistry and ecology . It says that chemical reactions take place twice to three times as fast at a temperature increased by 10  K.

The factor by which the reaction speed increases when the temperature is increased by 10 K is called the value: ${\ displaystyle Q_ {10}}$

${\ displaystyle Q_ {10} = \ left ({\ frac {k_ {2}} {k_ {1}}} \ right) ^ {\ frac {10 \, \ mathrm {K}} {T_ {2} - T_ {1}}}}$

And denote the respective reaction rate constants at the temperature or . With larger temperature differences, the RGT rule becomes increasingly imprecise and therefore generally no longer applies here. ${\ displaystyle k_ {1}}$${\ displaystyle k_ {2}}$${\ displaystyle T_ {1}}$${\ displaystyle T_ {2}}$

The RGT rule was established in 1884 by the Dutch chemist Jacobus Henricus van 't Hoff and expanded into the Arrhenius equation in 1889 by Svante Arrhenius .