What Freezes Faster Hot Water Or Cold Water

The molecules initially tighten up and bind together to create a solid form.

This is called the mpemba effect after the student who observed it. When water is frozen a similar reaction happens. The effect was named after the tanzanian student who in 1963 noticed that hot ice cream mix freezes faster than a cold. Long been freezing the freezer.

But observations over thousands of years as well as countless modern experiments have shown that the opposite is true under carefully controlled conditions hot water at times seems to freeze faster than cold water. In other words if you have water at 90 degrees c and water at 10 degrees c and the freezer is at 10 degrees c the hot water will lose heat five times faster than the cold water. Since hot water s molecules are already tightened up it has a head start on looking it should in its frozen state. The physics of why hot water sometimes freezes faster than cold water for decades physicists have debated whether the phenomenon exists and how to study it physicist avinash kumar of simon fraser.

However the cold water will still win the race. As the hot water cools it s rate of heat transfer will decrease so it will never catch up to the cold water. The phenomenon when taken to mean hot water freezes faster than cold is difficult to reproduce or confirm because this statement is ill defined. Factors that may cause hot water to freeze faster include evaporative cooling less chance of supercooling low concentration of dissolved gases and convection.

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Thus its volume decreases and with a decrease in volume the freezing time becomes less than if we take the same initial volume of cold water. What kind of water freezes faster hot or cold may depend on the fact that hot water has a higher evaporation rate than cold water. Sometimes hot water freezes more quickly than cold water. Cool water would take time to reach this point.

Why hot water freezes faster. It seems obvious that the answer should be no because all things being equal hot water takes longer to cool down than cold water and so it couldn t possible freeze faster. Freezing was official when sensors picked up an electrical signal created by ice formation. Hot water seems to freeze faster than cold water known as the mpemba effect.

Monwhea jeng proposes as a more precise wording. Ergo hot water freezes in less time than cold water does. There exists a set of initial parameters and a pair of temperatures such that given two bodies of water identical in these parameters and differing only in initial uniform temperatures the hot.