Does hot water freeze faster than cold water?

Any reason why hot water would freeze faster than cold water?

  • You would think cold water would freeze faster because it's already cold. But could hot water freeze faster for any reason?....for my chemistry class lol.

  • Answer:

    hot water contains more thermal energy and by freezing you are removing that energy. therefore, since the cold water already is closer to the freezing point because of its lower thermal energy it will freeze first.

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Initially, I would have reasoned that this proposition is BS, but I found too many references to this on the internet with examples and explanations to blow it off. So, under some conditions, hot water can freeze faster cold water. The Cliff notes version of this is that 1. The hot water will lose mass to evaporation thereby resulting in less mass to freeze. 2. The colder water will freeze on the outside first thereby providing a thermal barrier for the inside water. The hot water will freeze more uniformly and exter a slush state. 3. The colder water has more dissolved gases and these further act to insulate the water and slow the chilling. Understand, that where the water is a very similar temperature, the cooler water will freeze first, and your instincts are correct. Its just under some extreme conditions that this works. See the attached site for more info.

keith_housand

Hot water does not freeze faster than cold water. I think this is one of those myths that is so counterintuitive that people think it MUST be true. But it's not.

ManuscriptRe

It occurs because hot water is more likely to supercool. Hot water is more likely to super cool because there is less air in it.

Richardicus

We were told that in our thermal dynamics class. I cant remember exactly why, but yes its true, Only at a specific temp and pressure will hot water freeze faster than cold water. Not always just a special circumstance. I think it may have something to do with the pressure (Like a very extreme pressure used) but im not 100% certain.

wierdrabbitt

Hot water will only freeze faster than cold water if they are in separate environments. The hot water must be in an environment that absorbs heat much faster than the environment the cold water is in. For example: a freezer versus room temperature.

Brian L

because the molicules are moving around and easier to freeze in a heated state that at a room temp

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