Chapter 16 Kinetic Theory of Gases There is no preference to one direction or another2 由矢量合成( combine)法则,分子速度的方均值为 2 0=0+0+0 2=30 各方向运动概率均等 y ∑Chapter 16 Kinetic Theory of Gases 2 2 2 2 3 1 各方向运动概率均等 vx = vy = vz = v There is no preference to one direction or another 由矢量合成(combine)法则，分子速度的方均值为： 2 2 2 vx = vy = vz 2 2 2 2 2 v = vx + vy + vz = 3vx = =  i x i x N 2 2 1 2 3 1 v v v