At the recent ICPE (International Conference on Physics Education) in Prague, I found out that some physics teachers are using sulfur hexafluoride (SF6) in density demonstrations and experiments, and a search of the pages of TPT indicates that its use has been advocated on occasion for similar purposes.

This is a plea to such teachers and other users—sulfur hexafluoride is one of the most potent greenhouse gas known at present.1 Please find an alternative to release of this material.

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