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How long would it take to turn ice back to water?

What will turn to ice faster, warm or cold water?

  • A lady I work with told me to put warm water in my ice tray as it turns to ice faster. Now knowing the laws of physics and how molacules work, especially in relation to hot and cold and energy transfer, this is the exact opposite of what I would expect. I did not try it, as I know for a fact that she has been wrong on different things several times before. So can anyone give me an answer as to if warm water will turn to ice quicker, and if so, why? If you know that this is not true, I would like to hear from you as well. As for me, I am still going to put cold water in my ice tray until I find out for sure a reason not to.

  • Answer:

    Cold Water. - Most of the time. I have tried and tested this before (Tap Water). The hot water normaly takes about 10 minutes longer. When using Tempratures like 30 degrees and 70 degrees this will begin to vary and warm water might start freezing faster than cold water. Warm water can in fact sometimes freeze faster than Cold water but it very much depends on the conditions. What you are thinking of is the Mpemba effect. This could be due to a number of factors including but not limited to Evaporation (less water needed to be freezed), Dissolved Gasses and Convection. For a lengthy but thorough explanation see the link below. (Very reliable references) http://math.ucr.edu/home/baez/physics/General/hot_water.html

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warm water. I'm not a physicist I just know. clean your windshield with hot water in mid-winter and see what happens. then do it with cold water.

Chickadee

warm.

antidestablishmentarianismdude

It has been proven that warm or hot freezes before cold.

justswimmin

yes it does freeze faster then cold water

tigergirl301

can anyone provide a link showing this to be true?

absynthian

Someone says it has been proven hot water freezes faster - where? Prove it. That makes no sense. Its physics. Molecules in warmer water are moving faster than in colder water. Colder water needs to have less energy removed from it (courtesy of the surrounding air in the freezer) than hot water. Therefore, the colder water will freeze faster. As a real life example, look at a contained body of fresh water in the winter, like a lake. When freezing weather first arrives, it takes a long time for the lake to freeze. But, over the course of the winter, when there is a warm spell, you will see the ice melt from the lake. But, if temperatures get below freezing again, the lake freezes over much quicker than it did at the beginning of the winter.

2007_Shelby_GT500

I agree with the lady at work. It might be my imagination, but I use hot water in my ice trays and it seems to freeze faster than cold. :)

mzsunshine2378

hot water

hyper_932

While its counterintuitive, hot water will freeze faster than cold. Google it; you'll find 2,790,000 results for "will warm water freeze faster than cold." And they all say yes.

Vita

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