where ħ is the reduced Planck constant, a is the proper uniform acceleration, c is the speed of light, and k B is the Boltzmann constant. Thus, for example, a proper acceleration of 2.47 × 10 m⋅s corresponds approximately to a temperature of 1 K. Conversely, an acceleration of 1 m⋅s corresponds to a temperature of 4.06 × 10 K.