Have gas greater mass than air ?

or:Have gas greater mass than air ?or:Sulfur hexafluoride is often used for demonstrations. en.wikipedia.org/wiki/Sulfur_hexafluorideMany gases are d

or:Have gas greater mass than air ?

or:Sulfur hexafluoride is often used for demonstrations. en.wikipedia.org/wiki/Sulfur_hexafluorideMany gases are denser than air, and some of them are toxic, so do your research carefully before you try any experiments. For instance youtube.com shows people inhaling sulfur hexafluoride. But you need a breath of air before you inhale more.

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