Arrhenius versus Eyring-Polanyi Model
Arrhenius versus Eyring-Polanyi Model
The Arrhenius and Eyring–Polanyi equations are alternative models of the effect of temperature on the rate of chemical reactions and biological processes. This Demonstration generates data with the Arrhenius equation and fits it with the Eyring–Polanyi model and vice versa. It shows that although the two models are derived from different statistical mechanical considerations, they can be used interchangeably over a large range of temperatures. The two models diverge significantly only at very high temperatures: according to the Arrhenius model, the rate approaches an asymptotic value, while according to the Eyring–Polanyi model, it continues to rise. This suggests that curve fitting cannot establish either model's superiority beyond a limited range.