Chemistry

1309 Submissions

[1] viXra:1309.0076 [pdf] submitted on 2013-09-11 06:38:38

Mpemba Effect

Authors: Ilias J.Tyrovolas
Comments: 2 Pages. possible explanation for Mpemba effect copyrighted in 2012

Water molecules are dipoles positioned and oriented joined by hydrogen bonds. When water is heated this structure collapses (increasing entropy).If after the water is recooled to a lower temperature the structure is not reconstructed immediately but needed some time. This time is not always available inside a freezer because the cooling process is fast. The entropy reduction curves function of temperature S=f(T) appear retardation (lagging) relative to entropy growth curves. So, the water after was heated and recooled at the starting temperature, has more entropy than before it was heated. This means that molecules have now the same kinetic energy, but thermal motion before heating was more oriented by the structure mentioned above. So, after recooling random collisions are more possible leading to faster temperature’s reduction. The rate of temperature decrease is proportional to temperature.
Category: Chemistry