The temperature coefficient of most of the reactions lies between

Ratio of rate constants of a chemical reaction differing by ${10}^{\circ }\mathrm{C}$(in the vicinity of ${25}^{\circ }\mathrm{C}$) is called temperature coefficient.

Temperature coefficient $=\frac{{\mathrm{K}}_{\mathrm{t}+10}}{{\mathrm{K}}_{\mathrm{t}}}$

Generally $\frac{{\mathrm{K}}_{\mathrm{t}+10}}{{\mathrm{K}}_{\mathrm{t}}} = 2 \mathrm{or} 3$ for many reactions.