This is a figure from Physics Education Journal, vol 4, no. 3  May 1969. The experiment was done in University College Dar es Salaam, Tanzania, by Dr. Osborne. The experiment was done in a controlled and scientific way.

Here is the thing: 80'C degree water takes 3 times shorter time to get freezed than 20'C degree water.

Here is my speculation: Water phase change may be solely a function of the amount of heat in the measure of temperature, but the heat transfer impedance is affected by the heterogeneity of molecular energy. By  heterogeneity I mean the following: As the initial temperature of water increases, the water molecules gets more unstable. When the heat dissipates out of the water molecular group, ....

Ah my son bothers me. I will continue writing next time..




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