The general form of the Eyring–Polanyi equation somewhat resembles the Arrhenius equation : k = κ κ k B T h e − − Δ Δ G ‡ ‡ R T where k is the rate constant, Δ Δ G ‡ ‡ is the Gibbs energy of activation, κ κ is the transmission coefficient, k B is the Boltzmann constant, T is the temperature, and h is the Planck constant.