Explanation:
To be absolutely correct, we must note that the kilogram is a unit of mass. If measured in air the air provides buoyancy and the greater volume of a kilogram of copper means that the copper displaces more air and in turn gets more support than given to the kilogram of lead. Thus, on a scale in air the lead kilogram will show a heavier weight than the kilogram of copper.
Answer:
a kilogram of lead is heavier when measured in air than a kilogram of copper, provided both are weighed in the same location.
