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空气的密度为：0.00129.
1、密度比空气重的气体有：
氧气0. 00143
氟气0. 001696
氩气0. 00178
臭氧0. 00214
氪气0. 00374
氙气0. 00589
氡气0. 00973
氯气0. 00321
溴0. 00714
硫化氢0.00154
氯化氢0. 00164
氧化氮0. 00134
硫化氢0. 00154
乙烷0. 00136
丙烷0.00201
丙烯0.00192
二氧化碳0. 00198
二氧化硫0.00293
碘化氢0.00566
一氧化二氯0.00389
一氧化二氮0.00198
溴化氢0.0350
2、密度比空气轻的气体有：
氢气0. 00009
氦气0. 00018
氖气0. 00090
氮气0. 00125
氨气0. 00077
煤气0. 00060
一氧化碳0. 00125
甲烷0. 00078
乙炔0. 00117
扩展资料：
气体密度变化规律：
一般来说，不论什么物质，也不管它处于什么状态，随着温度、压力的变化，体积或密度也会发生相应的变化。联系温度T、压力p和密度ρ（或体积）三个物理量的关系式称为状态方程。气体的体积随它受到的压力和所处的温度而有显著的变化。对于理想气体，状态方程为
，式中R为气体常数，等于287.14米2（秒2*开）。如果它的温度不变，则密度同压力成正比; 如果它的压力不变，则密度同温度成反比。对一般气体，如果密度不大，温度离液化点又较远，则其体积随压力的变化接近理想气体；对于髙密度的气体，还应适当修正上述状态方程。
凡是分子量比29小的气体起密度一定比空气小,如H2,He,N2,F2,Ne,NH3,等
甲醛 ,氯化氢都比空气重,
比空气重的其他气体： 氩、二氧化碳、乙烷(C2H6)，丙烷(C3H8)，丁烷(C4H10)，所有Freons (CF4、C2F6、C2F4H2， CF2Cl2)
因为空气的相对分子质量为29,所以只要相对分子质量大于29的气体都比空气重,反之则比空气轻
例如:
重的有:氯气,二氧化碳,二氧化硫,三氧化硫,氧气,臭氧,硫化氢,氯化氢,二氧化氮......
轻的有:氢气,氨气,氮气,氟气......
比空气密度大
单质:氩氪氙,O2,O3,Cl2,F2.
化合物:S03,CO2,N02,N203,N2O5,CO2,除C2H2,CH4,C2H4外的所有有机气体,HCNO系.
比空气密度小
H2,He,N2,CO,NO,
CH4,C2H2,C2H4.
你知道世界上最轻的东西是什么吗？是羽毛？树叶？还是空气？其实都不是，有一种东西比空气还要轻，那就是气凝胶。如果把一块气凝胶放在花瓣上，它们一点儿都不会被压弯。更多知识内容，关注微信公众号 科学嬉游记
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