Currently it is used in isotope separation by taking advantage of the fact that different isotopes have different molecular weights, and therefore different densities.  
This law, first postulated in 1833, was used to prove that ozone has the formula O3 (oh-three).  Currently it is used in isotope separation by taking advantage of the fact that different isotopes have different molecular weights, and therefore different densities.  FTP, name this this law which states that the rate of effusion or diffusion of a gas is inversely proportional to the square root of its density.
This law, first postulated in 1833, was used to prove that ozone has the formula O3 (oh-three).  
Graham's Law