What Is a List of Gases Lighter Than Air?

By Staff WriterLast Updated Apr 16, 2020 1:24:23 AM ET
Masakazu Matsumoto/CC-BY 2.0

Gases that are lighter than air include water vapor, methane, hot air, hydrogen, neon, nitrogen, ammonia and helium. These gases have a lower density than air, which causes them to rise and float in the atmosphere.