Neither. They both have the same mass. "kg" is a measurement of mass. If you meant volume (the space taken up by the object), the feathers would have the greater volume.
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Bricks have a higher density- the molecules are packed much more tightly.
1 kg = 2.204 lbs so a kilo of anything - dimes, bricks, feathers, whatever - is more.
Neither! They both have the same mass of 1 Kilogram.
Bricks have more density whereas feathers have less comparatively. Space occupied ie volume = mass/ density. So space occupied is inversely related to the density. Hence feathers occupy more space than the bricks.
the gold would have more mass unless there is no gravity like on the moon then they would both fall at the same time.