k 2.31e-5*exp(20.492-104200[J/mol]/(R_const*re.T))[mol*kg^-1*m^-2*s] Arrhenius expression Kp 5.088e5*exp(-91200[J/mol]/(R_const*re.T)) Arrhenius expression kH exp(163200[J/mol]/(R_const*re.T)-22.426) Arrhenius expression ka 8.324e6*exp(135600[J/mol]/(R_const*re.T)-32.077)[m^9*mol^-3*s] Arrhenius expression p_CH4 re.c_CH4*R_const*re.T/1e5 Pressure, CH4 p_H2 re.c_H2*R_const*re.T/1e5+eps Pressure, H2