So let's rewrite this with uppercase m, where uppercase m is our molar mass and the bottom stays as NA multiplied by F. So this is another equation that gives us that same sedimentation coefficient given by s. So these two equations here are equal to one another. The only difference is in this case, we don't have Avagado's number. We have the lowercase m, where m is the mass of that single particle. But in this case, uppercase is the mass of Avogadro number of particles. So 6.02 times ten to the 23. So this is how you basically derive this equation.