does hot water freeze faster than cold water?

Question

i did an experiment but it said cold water froze faster.

Answer 1

Hot water can in fact freeze faster than cold water for a wide range of experimental conditions. This phenomenon is extremely counter- intuitive, and surprising even to most scientists, but it is in fact real. It has been seen and studied in numerous experiments. While this phenomenon has been known for centuries, and was described by Aristotle, Bacon, and Descartes [1-3], it was not introduced to the modern scientific community until 1969, by a Tanzanian high school student named Mpemba. Both the early scientific history of this effect, and the story of Mpemba's rediscovery of it, are interesting in their own right -- Mpemba's story in particular provides a dramatic parable against making snap judgements about what is impossible. This is described separately below.

The phenomenon that hot water may freeze faster than cold is often called the Mpemba effect. Because, no doubt, most readers are extremely skeptical at this point, we should begin by stating precisely what we mean by the Mpemba effect. We start with two containers of water, which are identical in shape, and which hold identical amounts of water. The only difference between the two is that the water in one is at a higher (uniform) temperature than the water in the other. Now we cool both containers, using the exact same cooling process for each container. Under some conditions the initially warmer water will freeze first. If this occurs, we have seen the Mpemba effect. Of course, the initially warmer water will not freeze before the initially cooler water for all initial conditions. If the hot water starts at 99.9° C, and the cold water at 0.01° C, then clearly under those circumstances, the initially cooler water will freeze first. However, under some conditions the initially warmer water will freeze first -- if that happens, you have seen the Mpemba effect. But you will not see the Mpemba effect for just any initial temperatures, container shapes, or cooling conditions.

Answer 2

Simple answer: Yes hot water freezes faster. The reason: The water molecules line up faster. No need to read long drawn out answers.

Answer 3

Yes the phenomenon that hot water freezes faster than cold is often called the Wpemba effect. there's a crap load of information if you just use the search the web for answers.

Answer 4

No, cold water freezes faster because the water doesn't have to cool down as many degrees before it freezes as it would if the water were hot.

Answer 5

There use to be a rumour that hot water contained less oxygen molecules therfore it froze faster but this turned out to be false! So........cold water DOES freeze faster!

Answer 6

Cold water freezes faster than hot water. Hot water takes longer to freeze because it has more degrees to fall to freezing temperature than cool water and, as a result, takes more time to reach the freezing point of 32 degrees than cool water does

Answer 7

I would say hot water freezes faster.

Answer 8

I have heard that cold water freezes faster, but hot water freezes clearer.

Answer 9

No, cold water freezes faster.

Answer 10

i believe hot water will freeze faster