You have a bag of cotton and an iron bar, each indicating a mass of 100 kg when measured on a weighing machine. Can you say which one is heavier and why?
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i say cotton is. dhjzjskxbdkzkx
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The density of cotton bag is less than that of the iron bar, so the volume of cotton bag is more compared to iron bar. So the cotton bag experience more up thrust due to the presence of air. Therefore in the presence of air the true weight of cotton bag is more compared to the true weight of iron bar.
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