Which is heavier 1 kg cotton or 1 kg iron?

Welcome back guys,
The above question must have been asked to you at least once in your life by your elderly teachers or friends.If not I am asking you today.Actually the answer lies in the fact that whether you are weighing them in presence of air or in vacuum.If measured in air the weight of cotton would be felt less due to the upthrust of air on it,giving it bit of floating effect.But in vacuum both will weigh the same.
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