does hot water freeze faster than cold water outside in cold weather? if so, why?

Answer 1

Although it seems to fly in the face of common sense, it is true that hot water can freeze faster than cold water. It's not common but it can happen given the right conditions.

This effect is called the Mpemba Effect after the person who rediscovered it (I think he was making ice cream at the time).

When I was studuing cryogenics (extreme cold) we tried to replicate the scenario in a lab but we didn't get it to work; others have told me it worked for them.

Mpemba Effect - http://www.school-for-champions.com/science/mpemba.htm

Answer 2

I tried this experiment once when it was +5 F outside, and again when it was -10 F. The hot water took longer to freeze when it was +5, but took the same amount of time to freeze at -10. So, perhaps it would take less time to freeze if it were -20 F or -30 F, but it never gets that cold here to test it. This could be due to the fact that heat dissipates from hot water faster, and the acceloration of heat dissipation tends to continue once started.

Answer 3

Listen carefully because there is confusion on this issue.

Cold water will become ice faster in cold weather than an equal amount of hot water.

BUT>>>and this is where the confusion comes in.

HOT WATER COOLS AT A FASTER RATE THAN COLD. It is just a scientific fact. it is faster to cool water from 80F to 70F
than from 70F to 60F

But when you put the hot water dish out with the cold water dish to make ice, the cold water dish has less temp to drop before it becomes ice. The hot water has to take time to cool to where the cold water started, and then take the same time from there to ice as the cold water did.

Answer 4

uh no. It doesn't. it takes hot water longer than cold water to freeze because it takes the molecules longer to slow down to reach the freezing point. Try it- put a cup of hot water and a cup of cold water in your freezer. which freezes first? The cold one.

Answer 5

I don't think so... because it has to cool off and then start freezing however cold water is already cool and then just starts to freeze. And if you really want to know for sure... go outside and do it yourself.

Answer 6

Yes. Cold is nothing than the absence of heat! The ability of hot water to lose heat is faster than that of cold water. Place your hand behind the refrig. and feel the warmth. Same concept.

Answer 7

Jason is absolutely correct, and his references are good. Read them before arguing to the contrary and you'll understand why.

Answer 8

Yes. I wont take credit for the answer. Google your question, there are various sites explaining.

Below are a couple sites.

Answer 9

no

Answer 10

no