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You have a bag of cotton and an iron bar...

You have a bag of cotton and an iron bar, each indicating a mass of 100 kg when measured on a weighing machine. In reality, one is heavier than other. Can you say which one is heavier and why ?

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In reality the bag of cotton will be heavier. This. is because the buoyancy of a fluid (air in this case) is directly proportional to the volume.
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