The new explanation might be added to the list of unconfirmed reasons for the effect — depending on whom you ask. Physicist Jonathan Katz of Washington University in St. Louis says the idea “just makes absolutely no sense.” In Mpemba experiments, the water freezes over a period of minutes or hours. As the temperature drops over that period of time, weak hydrogen bonds would reform and molecules would rearrange, Katz argues. Meanwhile, researchers are still debating whether the effect is even real. Attempts to observe the Mpemba effect have been inconsistent, with scientists struggling to produce it in a repeatable way ( SN Online: 3/23/10 ). In experiments published November 24 in Scientific Reports, scientists measured the time for hot and cold samples of water to cool to zero degrees Celsius . “No matter what we did, we could not observe anything akin to the Mpemba effect,” says Henry Burridge of Imperial College London. However, that study “excluded a very important aspect of the phenomenon,” chemist Nikola Bregović of the University of Zagreb in Croatia wrote in an email. Burridge’s study observed only the time to reach the temperature at which water freezes, not the initiation of freezing itself — a complex process that is difficult to control, and one of the reasons the effect is so hard to verify.
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