So we see, because they're equal, we see that s, the sedimentation coefficient is equal to v, the velocity of that object divided by Omega squared, where Omega is the angular velocity multiplied by r, where r is this distance right over here. So we see that s is equal to v divided by Omega squared r, which is equal to m one minus v bar row divided by F. And this is basically our derivation. Now, sometimes we express this in a slightly different way. So if we multiply this ratio top and bottom by some number, we're not going to change the value of it. So let's multiply top and bottom by Avogadro's number. So remember, Avogadro's number is given by uppercase NA, and this gives us Avogadro's number of molecules.