From the kinetic energy formula it can be shown that v p = 2 ⋅ ⋅ k B T m , v ¯ ¯ = 2 π π v p = 8 π π ⋅ ⋅ k B T m , v rms = 3 2 v p = 3 ⋅ ⋅ k B T m , where v is in m/s, T is in kelvin, and m is the mass of one molecule of gas in kg. The most probable (or mode) speed v p is 81.6% of the root-mean-square speed v rms , and the mean (arithmetic mean, or average) speed v ¯ ¯ is 92.1% of the rms speed (isotropic distribution of speeds).