True, the different volume of air displaced by the iron and the cotton would cause them to weigh differently on a scale. However, this weight difference is due to the buoyancy of the material in the air, not due to their actual mass. The mass of the two materials remain the same, regardless of the air displaced. This is because the buoyancy force is counteracted by the gravitational force, meaning that any weight difference due to buoyancy is cancelled out. Therefore, one kilogram of iron and one kilogram of cotton will always have the same mass and weight, regardless of the displacement of air.
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