The Arrhenius equation describes the relationship between reaction rate and temperature for many physical and chemical reactions.
K = A e⁻(Eₐ /RT)
Where A is the Arrhenius factor or frequency factor. This is also called pre-exponential factor. It is the specific constant for a particular reaction. R is the gas constant, T is the temperature and Eₐ is the activation energy measured in joules/mol (J mol⁻¹).