When hot water freezes before cold

@article{Katz2006WhenHW,
  title={When hot water freezes before cold},
  author={J. I. Katz},
  journal={American Journal of Physics},
  year={2006},
  volume={77},
  pages={27-29}
}
  • J. Katz
  • Published 27 April 2006
  • Physics, Materials Science
  • American Journal of Physics
I suggest that the origin of the Mpemba effect (the freezing of hot water before cold) is due to freezing-point depression by solutes, either gaseous or solid, whose solubility decreases with increasing temperature so that they are removed when water is heated. The solutes are concentrated ahead of the freezing front by zone refining in water that has not been heated, reducing the temperature of the freezing front, and thereby reducing the temperature gradient and heat flux, slowing the… 

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