xkcd

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submitted 5 months ago by [email protected] to c/[email protected]

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I'm an H⁺ denier, in that I refuse to consider loose protons to be real hydrogen, so I personally believe it stands for 'pretend'.

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[–] [email protected] 13 points 5 months ago

I assumed it was rho (ρ) of hydrogen since rho is used for density...