While normally cold water is expected to freeze faster than hot water, under certain conditions this may be the opposite. The causes and consequences of this effect have been the subject of research from past to present. We investigated whether this rumor, which we often hear today, reflects the truth.
No matter what the temperature of the water is before it starts to freeze We learned in school that it had to reach freezing point.
So, is it possible for hot water to reach the freezing point faster than cold water? Actually to this question It is difficult to give a clear answer because we may need to create some situations.
This situation was first observed by Aristotle.
Trials of this event 4th century BC until the time of Aristotle It endures. Aristotle, who observed this event for the first time, used a special word for this situation: “The fact that the water has been heated before helps it freeze quickly because it cools down faster. That’s why many people, when they want to cool hot water quickly, put it under the sun…”
In the future Francis Bacon and Descartes This situation, which was also noticed by , caused physicists to discuss this issue for a long time.
Nowadays, this effect even has a name: Mpemba Effect.
Erasto B. Mpemba
In the not too distant past, in 1963; Student named Erasto Mpemba from Tanzania, He noticed that the ice cream he made with warm milk freezes faster than the one made with cold milk.
Today, this effect is published in a scientific article for the first time It gained this name with the contribution of Erosto Mpemba. This situation is explained as follows:
Two identical containers the same amount of 70 degree hot water, 30 degree cold water Let’s assume we put . The freezer will use more energy to freeze hot water. A decrease in the total mass of hot water will be observed due to the evaporation of hot water and the change in the amount of gases in it.
Well hot water makes a greater effort to reach the freezing point but cold water only struggles to get to the point of extreme cold.
Let’s not forget that this is just a theory!
According to the Mpemba Effect research conducted by Nanyang Technological University in 2014 When hot water is heated, hydrogen bonds stretch and energy release occurs faster than in cold water.
We can say that energy release technically means that hot water cools faster. With this energy release, actually under certain conditions There are scenarios where hot water freezes faster than cold water.
In summary, we can say that; The initial heat transfer rate will occur faster in hot water than in cold water.. However, there has not yet been sufficient evidence that this works at all times and under all conditions.
It is thought that the biggest factor in this effect is the presence of gas and dissolved solids in liquids. Considering that these factors reduce the rate of heat conduction, they can cause hot water to freeze faster. So in short, for this effect a good example of theory we can say.
Trying this theory at home is free! If you want right now using tap water You can perform this experiment yourself at home. Who knows, maybe you can make a contribution to strengthening this theory.
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