The list of lighter than air gasses (aerosols) is long.

Name: The list of lighter than air gasses (aerosols) is long.
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Lighter than air gases, specifically those that are buoyant in air, primarily include hydrogen, helium, methane, ammonia, and hot air due to their lower density compared to the surrounding atmosphere. The list is not particularly long when considering gases that are commonly used for buoyancy purposes.

The List of Lighter Than Air Gasses (Aerosols) Is Long