Question regarding units of measurement.

Question

If some "unit" is per ft^3 or say per m^3 or kg/metre^3. it means that "certain amount" per cubic box, which is measured in 1m length X 1m breadth X 1m height. right?

i know mass upon volume is called density.

Answer 1

ft^3 means cubic feet and when any unit used to measure length is raise to the third power it is volume.