、混合气体成分 1质量分数( mass fraction of a mixture) ∑ 2体积分数 volume fraction of a mixture) Σq1=1 3摩尔分数( mole fraction of a mixture) x ∑x5 三、混合气体成分 =  i =1 i i w m m w 2.体积分数(volume fraction of a mixture) =  i =1 i i V V   3.摩尔分数(mole fraction of a mixture) =  i =1 i i x n n x 1.质量分数(mass fraction of a mixture)