It seems the pound has since been redefined and split into separate units: pound mass and pound force, the former in terms of kilograms (1 lb = 0.45359237 kg) a

It seems the pound has since been redefined and split into separate units: pound mass and pound force, the former in terms of kilograms (1 lb = 0.45359237 kg) and the latter in terms of the force exerted by one pound of mass in earth’s gravitational field (standard g = 9.80665m/s^2). So using the word pound without qualification is ambiguous in contexts where it’s not clear whether mass or force is meant.