(2) The root- Mean-Square Speed(方均根速率vrms uf(odu 23T 3kT 3RT RT ≈1.73 rms V M M rms can be used to calculate average translational kinetic energy Kavg(2) The Root-Mean-Square Speed (方均根速率)vrms: vrms can be used to calculate average translational kinetic energy Kavg.   = 0 2 2 v v f (v)dv m 2 3kT v = M RT M RT m k T 1.73 2 3 3 vrms = v = = 