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

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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 and then decrease

This question was posed to me during an interview for a job.

Query is from Work Done topic in portion Kinematics of Engineering Physics I

1 Answer

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Best answer
Correct option is (a) Increase

To elaborate: The heat energy possessed by water gets converted into mass when ice is formed. This increases the mass. Therefore when water is cooled to form ice, then mass of the water should increase.

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