n, T n RT 2 n,rt nR+ RT D n1+n2+ 机邵学电國图 n=n1+n2+… 尺 7V p = nRT = , = , 2 2 1 1 V n RT p V n RT p ( ) V RT n n V n RT V n RT p = 1 + 2 += 1 + 2 + n =n1+ n2+