Answer:
Pound mass is the unit of mass and which is used in United states customary to describe the mass Slug is also a unit of mass .Pound mass is lbm. But on the other hand pound force is the unit of force.Pound force is lbf.
In SI unit ,the unit of mass is kilogram(kg) and the unit of force is Newton(N)
In CGS system the unit of mass is gram and unit of force is dyne.
