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I see evidence of use as a common noun in English, such as google books:"glass of H2O". "glass of H₂O" get no hits, but I think that's because of Unicode and Google issues. Mglovesfun (talk) 15:39, 25 April 2012 (UTC)

I have created an English entry. — TAKASUGI Shinji (talk) 06:14, 10 May 2012 (UTC)
You can now successfully search for "glass of H₂O" on Google. There are almost no results. Equinox 17:26, 15 June 2016 (UTC)