Ok. Boyle's law and Graham's law are both gas laws. So Boyles law says that the more pressure the less volume. It might help to know about hydrodynamics or just fluids in general. So the more densely packed something is, the slower it goes. The video in the Sources will explain better (Because Dr. Osborne is teaching it, it has to be good). So the bigger the particles going through a constant volume then the more dense. So that leads into Graham's law because the more dense the fluid, the slower it goes. Graham shows the relationship proportional to the sizes of the particles