If mass-energy equivalence is taken into account, when water is cooled to form ice, the mass of water should (a) increase (b) remain unchanged (c) decrease (d) first increase then decrease

Answer: (c). Water gives out latent heat when it freezes, so ice has less energy than the water. Δ m = (Δ E)/(c²), so less energy means less mass. So the answer is (c) decrease.

If mass-energy equivalence is taken into account, when water is… | JEE Main 2002 (AIEEE)

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Mass Defect & Binding Energy

If mass-energy equivalence is taken into account, when water is cooled to form ice, the mass of water should

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Answer: (c)

Water gives out latent heat when it freezes, so ice has less energy than the water.
$\Delta m = \dfrac{\Delta E}{c^2}$ , so less energy means less mass.
So the answer is (c) decrease.

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