Arrhenius formula and the empirical formula of the relationship between reaction rate constant and temperature. The formula k = AE-ea/rt. K is the rate constant, r is the molar gas constant, t is the thermodynamic temperature, ea is the apparent activation energy, and a is the pre-exponential factor (also called frequency factor). Another form is also commonly used: lnk = lna-ea/rt According to this formula, the LNK ~ 1/t diagram is a straight line, and the apparent activation energy ea can be obtained from the slope, and the pre-exponential factor a can be obtained from the intercept.