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Robot B9
Feb7-11, 11:26 AM
P: 36
Helium would not work. In a short time the difference in density would cause there to be too much oxygen at low altitudes as the helium tended to escape from the planet...

Oxygen/nitrogen works cause they have close to the same mass, oxygen about 16 and Nitrogen about 14. But Helium is about 4 and is, as they say, lighter then air.