The collision frequency Z is only weakly dependent on temperature, while the steric factor P is always less than one.  
Building on the kinetic theory of gases, it was originally formulated by J.J. Hood, although its namesake later provided a true theoretical basis for it.  The collision frequency Z is only weakly dependent on temperature, while the steric factor P is always less than one.  Taking the logarithm of both sides allows it to be put in a linear form, which proves to clearly illustrate the dependence of the rate constant on temperature and, of course, on activation energy.  FTP, name this equation of chemical kinetics, named for a Swedish scientist.
Building on the kinetic theory of gases, it was originally formulated by J.J. Hood, although its namesake later provided a true theoretical basis for it.  
Arrhenius equation