Quote:
Originally posted by that G.U.Y.
Actually O2 is not Oxygen; it is the symbol for diatomic oxygen (O₂)
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Yes, but pure oxygen gas only exists in the diatomic form. There's no such thing as O (gas).
Anyways, an abbreviation is meant to make the title shorter. So just use AO instead of AO2. The latter contains an unnecessary character and keystroke.
