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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?

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The volume of the bag of cotton would be much more than the iron bar and the upward buoyant force on the bag of cotton would be more than that acting on the iron bar and therefore the value is shown in case of the bag of cotton must be lesser than the actual value by a larger amount and therefore the bag of cotton is heavier than the iron bar.

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