You have a bag of cotton and an iron bar. each indicating a mass of $100 k g$ 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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Solution

Weight machine gives weight not the mass.
As far as weight (and not mass) is concerned, cotton is heavier than iron as its decrease in weight due to air displaced is more than weight of the air displaced by iron. Since decreased weight of cotton and iron in air are equal, the real weight of cotton in vacuum is more than the real weight of iron in vacuum.

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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?

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