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Classical Mechanics Level 1

When you put hot water and cold water in the freezer together, which one freezes first?

Cold water At the same time Hot water

Syed Hamza Khalid by Syed Hamza Khalid , 17, France

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3 solutions

Syed Hamza Khalid
Nov 27, 2018

A 10-year-old kid first found this out and to his honour, this effect is under his name. Check out the link

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Laszlo Mihaly
Nov 28, 2018

This is a highly controversial question. Wikipedia has a long list of references to serious scientific journals, and most of the researchers concluded that the Mpemba effect does not exist.

One possibility is that the originally cold water remains colder all the time, but it enters to a supercooled state and freezes later than the originally hot water. Supercooling depends on many factors that are difficult to control experimentally.

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The Rate of cooling, d Q d t α Δ θ \dfrac {dQ}{dt} \alpha \Delta \theta where Δ θ \Delta \theta is the temperature difference.

Since, the Temperature Difference, Δ θ \Delta \theta between Hot water and Freezer is more than that between Cold water, H O T \boxed{HOT} water Cools faster.

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This solution is not correct, because it neglects the fact that the hotter object stores more heat.

Laszlo Mihaly - 2 years, 6 months ago

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I think according to me when I said that temperature difference in hot water is more, it is clear that the hot water has more heat stored in it as it is the heat because of which its having higher temperature.

Just tell me what changes I need to make in my solution.

A Former Brilliant Member - 2 years, 6 months ago

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