Graham's Law of Effusion/Diffusion (r1/r2 = sqrt(M2/M1))

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r1/r2 = sqrt(M2/M1)

What each symbol means

SymbolWhat it stands for
M_iMolar mass (consistent units, ratio only)
r_iRate of effusion/diffusion

When to use this

Same T,P; ideal gas; comparable experimental setup.