Estimation: A brick โ 1 kg, so 2 bricks โ 2 kg. Feather โ 0.01 g. Coin โ 8 g. Mobile phone โ 200 g. Comparing: Which is heavier: 3 kg of cotton or 3 kg of iron? TRICK QUESTION! Both are 3 kg. Weight depends on amount, not material. 3 kg = 3 kg regardless of material. Cotton just takes up more space (less dense).
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