Now V bar is known as the partial specific volume and more specifically, it's the reciprocal of the density of that particle. So V bar is equal to one divided by the density of that particle. Now this row is basically the density of our medium and F is basically the frictional coefficient of that particle. And this has to do with the shape of that particle. So the more spherical our particle is, the lower the value of F is and the less spherical that particle is, the higher the value of F is. So we see that the higher the F is, the higher the sedimentation coefficient is, the higher the sedimentation speed is.