Mpemba effect - when the hot water freezes faster than cold
In 1963, the student from Tanzania named Erasto Mpemba asked his teacher a silly question - why in his warm cream freezer freezes faster than cold? The teacher just laughed Erasto.
A few years later Mpemba asked a similar question physicist Denis Osborne. He invited him to carry out an experiment - to put in the freezer for two identical containers with water. In one container, the water should have a temperature of 35 degrees, and in the other - 100 degrees. Erasto assured physics, that the container of hot water freezes faster.
Osborne checked words Mpemba and experienced firsthand that the hot water actually freezes faster. Later, he co-authored with Erasto published on this topic a scientific study. The effect of rapid freezing of hot water than cold called "Mpemba effect". What makes hot water freeze faster? Scientists are still continuing to fight on this mystery. In one version, the rapid cooling of the hot water is due to enhanced evaporation on another - due to stretching of the hydrogen bonds in the molecules. But a clear answer to the riddle Mpemba still no.