The mean square speed is the second-order raw moment of the speed distribution. The "root mean square speed" v r m s {\displaystyle v_{\mathrm {rms} }} is the square root of the mean square speed, corresponding to the speed of a particle with median kinetic energy , setting b = 1 2 a 2 = m 2 k T {\textstyle b={\frac {1}{2a^{2}}}={\frac {m}{2kT}}} : More @Wikipedia

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