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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’.
Alt text:
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’.
I assumed it was rho (ρ) of hydrogen since rho is used for density…