2.2气体 2.2.1理想气体状态方程 若用 m一气体的质量，g M一气体的摩尔质量，gmol p一气体的密度，g/㎡ 则 pY=aRT=对R7 →pM=gRT=pRT 若用 m — 气体的质量，g M — 气体的摩尔质量，g/mol  — 气体的密度，g/m3 则 RT RT V m pM RT M m pV nRT  = =  = = RT RT V m pM RT M m pV nRT  = =  = = RT RT V m pM RT M m pV nRT  = =  = = RT RT V m pM RT M m pV nRT  = =  = = RT RT V m pM RT M m pV nRT  = =  = = RT RT V m pM RT M m pV nRT  = =  = = RT RT V m pM RT M m pV nRT  = =  = = RT RT V m pM RT M m pV nRT  = =  = = RT RT V m pM RT M m pV nRT  = =  = = 2.2 气体 2.2.1 理想气体状态方程