 Density versus molar second virial convention (source code)

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= Density versus molar second virial convention

In the number-density <virial expansion>, $p/(nk_BT)=1+B_2n+\cdots$, so $B_2$ has units of <volume>. With <molar concentration> instead, the coefficient is $B_{2,\rm mol}=N_AB_2$, where $N_A$ is the <Avogadro constant>.

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