Loading ...This is called the Mpemba effect after the student who discovered this phenomanon. The high school student Mpemba from Tanzania, Africa discovered in 1969 that hot water freezes faster than cold water while making icecream.
His teachers did not believe it was possible, and it took several years until university professors finally accepted his discovery.
It is unclear what the exact cause of this phenomenon is, but there are several factors that have influence on the mpemba effect:
A part of the water vaporizes which already cools down the remaining water and of course has the effect that there is less water left to be freezed.
Besides the following has to be taken into account such as the possibility that the hot water holds less dissolved gasses, there is a difference in convection currents when cooling down and of course the surroundings can have effect as well.
Source: http://www.physics.adelaide.edu.au/~dkoks/Faq/General/hot_water.html
yall need some picture of this experiment. ya digg