Why does air not fall to the ground due to gravity? Also, why do lighter than air gases like helium rise?
In: Physics
If you want some practical examples of what the comments are mentioning, there’s a common school experiment involving paper bags attached to a pole, like a beam balance. You can use CO2 from dry ice, or combining vinegar and baking soda, or however they did it, and pour it into one of the bags. CO2, being heavier than most other gasses in air, will make the bag sink.
You can also float a paper/foil boat on sulfur hexafluoride because it is so heavy.
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