Which gases are lighter than air?
by 
wickedwillie
ANSWERS: 3
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All of these 14 gases—and no others!—are lighter than air at the same temperature and pressure. Neon Hydrogen fluoride Water (steam) Carbon monoxide Ammonia Nitrogen Hydrogen cyanide Methane Ethylene Acetylene Methllithium Diborane Helium Hydrogen If you meant which ELEMENTS, then it would be just Neon Nitrogen Helium Hydrogen http://en.wikipedia.org/wiki/Lighter_than_air---
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Air is not a single element or compound. It is mostly nitrogen, oxygen, argon and carbon dioxide, but has hundreds of others of compounds in very small amounts. Taking nitrogen, the lightest of the abundent gases then the following are lighter: Helium Hydrogen (These are gases at 298K and at 1 atm)
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ALL GASES THAT RISE INTO THE ATMOSPHERE SEPARATES INTO NOTHINGNESS. THATS NATURES WAY OF PROTECTING EARTH.
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