Question

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

Answer 1

the cotton bag is heavier than the iron bar ,The cotton bag experences larger up thust of air than the iron bar SO , the weighing machine indicates a smaller mass for cotton bag than its actual mass .