Question

Which is heavier a kilogram of iron or a kilogram of cotton?

Answer 1

Hello.

By mass 1kg of cotton and 1kg of iron weigh same I.e. none is heavier... But on earth 1kg of iron would be heavier.Density of cotton is less than density of iron, so it would have more volume. So 1kg of cotton will displacemore air particles than 1kg of iron.
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