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https://xkcd.com/2943...
RememberTheEnding , 23 days ago I assumed it was rho (ρ) of hydrogen since rho is used for density...
I assumed it was rho (ρ) of hydrogen since rho is used for density...
xkcd #2943: Unsolved Chemistry Problems ( imgs.xkcd.com )
https://xkcd.com/2943...