Answer:
Actually
mass of cotton is more than the mass of iron bar. This is because Weight
measured = Actual weight - buoyant force Actual weight = weight measured +
buoyant force The volume of cotton is much more than the volume of iron bar, so
buoyant force (B = volume of object x density of air x g) of air on cotton is
much more than that of air on iron bar, so mass of cotton will be more than the
mass of iron bar.
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