who do objects that are of same size sometimes have different weights
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Answer:
When we say weight generically, I'll assume that we generally mean that at the surface of the Earth, the force of the Earth's gravity on the mass of an object is how much it weighs for us. Assuming that, the difference between two objects of different weights but of the same volume is density, which is measure as mass per unit volume. It comes from the atomic weight of the atoms composing an object and how closely packed is the material composing that object. The old trick question, what weighs more, a pound of feathers and a pound of iron, plays off this property to confuse which is heavier when they weigh the same, a pound. But the volume of the pound of feathers in their natural state would be much larger than that of the much denser pound of iron. However, as you have asked, the same volume of feathers and volume of iron, let's say a cubic meter, would lead to wildly divergent weights when measured here, because of the wildly different densities.
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