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Does hot water freeze faster than cold water?
Will - In 1963, 13 year old Tanzanian Erasto Mpemba was making ice cream at school due to time constraints.
He decided not to let the mixture cool down and instead put it straight in the freezer, and found to his surprise that the mixture had frozen faster than everyone else's.
Download this stock image: Erasto Mpemba from Tanzania in Africa, presents the Mpemba Award via video link to Nikola Bregovic from Croatia.
So was born, the Mpemba effect, the theory that hot water freezes faster than cool water. But what does the science say? I asked an expert in fluid mechanics at Imperial College, Henry Burridge. Fortunately for us, Henry has spent a lot of time studying this theory.
Henry - Well, we started out really trying to prove why this would happen in the hope that it really did happen and looked very much at the cooling process, the idea being that if water cooled in such a way that it gained a lot of momentum, this could potentially cause warmer water to cool at a greater rate than colder water.
We did definitely observe that, but we never observed that that greater rat