That is right, whole peppercorns are solid, and contain less air than ground peppercorns, which is an amorphous solid with a lot of airy pockets at the molecular level. If you suck the air out, it will be lower in volume compared to a spoonful of whole peppercorns (as they will have some air between the peppers as well

If when you run you run at 0.0 km per hour, then you will just stay there. Forever.