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As far as the etymology, doesn't it come from "potential of hydrogen"? Is that the same thing as "From p, denoting negative logarithm, and H, denoting hydrogen."? E. abu Filumena

According to the dictionary that came with my Mac: ORIGIN early 20th cent.: from p representing German Potenz ‘power’ + H, the symbol for hydrogen. ---> Tooironic 00:45, 11 November 2011 (UTC)