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Does hot water freeze faster than cold water?

I've heard it said that cold water will come to a boil faster than hot water, and hot water will freeze faster

  • than cold water. Any truth to this?

  • Answer:

    I don't know the first one, but the second one- hot water freezing faster- is correct. It is known as the Mpemba effect, named after an african highschool student who insisted and published the fact even most of his instructors thought him daft. It's a great story actually. You can read about it and some explanations for this effect at: http://www.lsbu.ac.uk/water/explan.html

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I've heard it said that people will never stop suprising you with their stupidity. Water has to be below 32 degrees F to freeze. If you put water that is 211 Degrees F in the freezer, it has to get colder: 210, 209, 208..... all the way down to 31. How is this faster than putting 32.5 degree water in the freezer? The same applies to boiling cold water. Don't believe me? Test it out Rainman.

DrRocco

Ive heard that certain minerals build up in hot water heaters that interact with the chemical bonds in water. Similarily, its said that if you add table salt to water (not just for flavor) it will make the water come to a boil faster. I say conduct an experiment, put two pots of water on stove one with one without salt....or one cold one hot and time each pot for boiling time. IF you want ot get more technical use bottled deionized water, that would eliminate the mineral build up theory I was talking about. ~Jenn

nifferbugg130

yes. don't believe me.....walk outside on a freezing day and throw ice cold and hot water on your car.....tell me which one is frozen almost instantly.

Nunoyvgvna Awi

Yes there is. I have done a little "experiment" on this matter. Hot water will definitely freeze faster than cold. In most cases much faster.

Secrets

None whatsoever.

...mr2fister...

No, not at all. Hot water will have to cool down first but cold water can straightaway freeze. This also works the other way round.

Br_T

Hot water will freeze faster than cold water under some (but certainly not all) circumstances. Google "Mpemba effect" for more on this. I don't know of any evidence that cold water will boil faster than hot, though. Also, there are some plausible explanations for the Mpemba effect, but they don't apply to the boiling water case. I'm inclined to think the boiling water thing is just an imaginary corollary to the Mpemba effect.

injanier

have you ever watched hells kitchen???a lady got laughed at for saying that about cold water boiling faster...that is just silly talk...if anything make sense it would be the other way around!!!

noseyroseysillywillie

no that's crazy talk

saltydunes24

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