dorsal/arxiv
View SchemaWhen hot water freezes before cold
| Authors | J. I. Katz |
|---|---|
| Categories | |
| ArXiv ID | physics/0604224 |
| URL | https://arxiv.org/abs/physics/0604224 |
| DOI | 10.1119/1.2996187 |
| Journal | Am. J. Phys. 77, 27--29 (2009) |
Abstract
I suggest that the origin of the Mpemba effect (the freezing of hot water before cold) is freezing-point depression by solutes, either gaseous or solid, whose solubility decreases with increasing temperature so that they are removed when water is heated. They are concentrated ahead of the freezing front by zone refining in water that has not been heated, reduce the temperature of the freezing front, and thereby reduce the temperature gradient and heat flux, slowing the progress of the front. I present a simple calculation of this effect, and suggest experiments to test this hypothesis.
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"abstract": "I suggest that the origin of the Mpemba effect (the freezing of hot water\nbefore cold) is freezing-point depression by solutes, either gaseous or solid,\nwhose solubility decreases with increasing temperature so that they are removed\nwhen water is heated. They are concentrated ahead of the freezing front by zone\nrefining in water that has not been heated, reduce the temperature of the\nfreezing front, and thereby reduce the temperature gradient and heat flux,\nslowing the progress of the front. I present a simple calculation of this\neffect, and suggest experiments to test this hypothesis.",
"arxiv_id": "physics/0604224",
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"J. I. Katz"
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"doi": "10.1119/1.2996187",
"journal_ref": "Am. J. Phys. 77, 27--29 (2009)",
"title": "When hot water freezes before cold",
"url": "https://arxiv.org/abs/physics/0604224"
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