In certain fields, such as plasma physics, it is convenient to use the electronvolt to express temperature. The electronvolt is divided by the Boltzmann constant to convert to the Kelvin scale : 1 e V / k B = 1.602 176 634 × × 10 − − 19 J 1.380 649 × × 10 − − 23 J/K = 11 604.518 12 K , where k B is the Boltzmann constant.