What is the Mpemba effect?
The Mpemba Effect. Although Aristotle, Bacon, and Descartes all described hot water freezing faster than cold water, the notion was mostly resisted until the 1960’s when a high school student named Mpemba noticed that hot ice cream mix, when placed into the freezer, would freeze before ice cream mix that had been cooled to room temperature …
What happens when water is not supercooled?
Water that is not supercooled is more likely to become solid when it reaches the freezing point of water. Convection : Water develops convection currents as it cools. Water density usually decreases as temperature increases, so a container of cooling water typically is warmer on top than on the bottom.
Why did Mpemba ask his teacher to explain his observations?
When Mpemba asked his physics teacher to explain the observations, the teacher told Mpemba his data must be in error, because the phenomenon was impossible. Mpemba asked a visiting physics professor, Dr. Osborne, the same question. This professor replied that he did not know, but he would test the experiment. Dr.
Why does hot water freeze faster?
Factors that may cause hot water to freeze faster include evaporative cooling, less chance of supercooling, low concentration of dissolved gases, and convection. Whether hot or cold water freezes more quickly depends on the specific conditions.
Why did Mpemba repeat his experiment with water rather than ice cream mixture?
Mpemba repeated his experiment with water rather than ice cream mixture and found the same result: the hot water froze more quickly than the cooler water. When Mpemba asked his physics teacher to explain the observations, the teacher told Mpemba his data must be in error, because the phenomenon was impossible.
What are some examples of effects of the environment?
One example would be warm water melting a pre-existing layer of frost, permitting a better cooling rate.
What are the factors that affect the amount of water remaining frozen?
Different mechanisms come into play, depending on the conditions. The main factors appear to be: Evaporation : More hot water will evaporate than cold water, thus reducing the amount of water remaining to be frozen.
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