According to me cotton will be more lighter as air is a fluid and Archimedes principal applies on it. As cotton occuies more volume it will feel more upthrust and more loss in weight. Therefore it if lighter.
1kg of iron. Bcoz atmospheric pressure on iron surface ís lesser than that on the cotton surface. Larger in the surface area greater is the atmospheri
c pressure and weight increases on
cotton. If the weighing is
perfom in the vaccuum,objects having same mass will have same weight.
1 kg of cotton is heavier than
Iron... As cotton occupied more
space and displaced more air so
upthrust force on cotton is more
than iron.. So to make 1 kg of
cotton in actual more than 1 kg of
cotton is used to counter balance
the upthrust force...