is it true hot water freezes quicker than cold water?

Answer 1

Yes it is on certain circumstances. It's a phenomena called the Mpemba Effect, it was discovered by 2 teenagers while creating an experiment to a science fair. The funny thing is that their professor doubted about it, but later it was confirmed from scientists.

If you want more info: http://en.wikipedia.org/wiki/Mpemba_effect


Merry Christmas,


FCH.

Answer 2

ONLY ICE COLD WATER FREEZES.I really dont know if your saying a ten tonne load of boiling water when placed in a freezer room with a a 10 tonne load of water from the same source but at zero centigrade would freeze quicker than the cold one.To clarify further,lets say both the hot and the cold water are in identical,but separate , containers.
It would be nice just for once,when this question crops up that we have some clarity.

Answer 3

Water starts to freeze at 0 degrees C. Pour some liquid nitrogen on the hot water, and set the cold water outside on a cool day, and sure enough, your hot water froze first. Reverse it, and the cold water freezes first.

But if you put both in a freezer, I would have to lean to say the colder water would freeze first, because for the water to freeze it would have to lose the heat it has in it already. The hotter water has more heat and therefor would seem to me to have to take longer to move the heat. That is assuming that heat transfer is linear, but even if it's not, the only other option I can think of is that they would both freeze at the same time, because the hot water would have to reach a point where it is the same temperture as what the cold water was at previously.

Answer 4

With the same volume of each, the hot water will give up its heat more quickly than the cold and will arrive at the freezing point before the cold water. (The higher the ΔT, the faster the heat transfer rate).

Answer 5

Hot water takes longer to cool down than cold water, BUT
if you start with equal amounts of hot and cold water, the hot water will lose a lot of water through evaporation, which cools the water more quickly, and means there is less water to cool down. In that case, the hot water can freeze faster than the cold.

But if you made 1 gram of ice from cold water, and 1 gram of ice from hot water, the cold would freeze first.

Answer 6

This is a common myth. Hot water cannot possibly freeze faster than cold water, because it has to go through the stage of being cold water on its route to turning into ice.

It is possible, in very cold weather, for the vapour from hot water in a partly filled container to form frost higher up the container quite quickly, which may be where this myth comes from.

Answer 7

Yes.Because heat travels easier from hot things to cold things than hot things to warm things.

Answer 8

that is true because the water is changing at a faster rate it causes the temp to lower in a less amount of time

Answer 9

no because the temperature has to reach 0 before it can freeze. hot water has a higher temperature than water at room temperature so colder water takes less time to freeze.

hope i have helped.

Answer 10

Now, think about this. If water freezes at 32 degrees F, wouldn't Hot water have to be lowered to 32 Degrees F to freeze.............take sometime before you answer...................now you got it, I see that smile on your face..............not going onto college I suspect..........