So if we get a negative value for our sedimentation coefficient, that means that particle essentially floats on top of our fluid. It will not travel through the fluid. On the other hand, if the product of V and Rho, V bar and row is less than one, what that means is the density of the particle will be greater than the density of the fluid. And so our object, the particle, will sink in the fluid and that means that it will travel down along the fluid and to the end of that test tube. And if we look at this equation, if this quantity is less than one, then one minus a value less than one is a positive quantity. That means the S value, the sedimentation coefficient, will, in fact be a positive value.