Freezing hot water?

[karl]

Want to win some money? Solve this question



It is the baffling question which has perplexed the world's greatest scientific minds and even eluded great thinkers like Aristotle.
But now scientists have become so infuriated about the mystery of why hot water freezes faster than cold, that they have put up a cash reward to find the answer.
The Royal Society of Chemistry has offered £1,000 for a member of the public to come up with a convincing explanation for the phenomenon, which has mystified humankind.

Puzzler: The phenomenon of hot water freezing more quickly than cold has been dubbed the Mpemba Effect
The scientific problem, which has become known as the Mpemba effect, has also defeated Francis Bacon and René Descartes.


See link below



Read more: http://www.dailymail.co.uk/sciencetech/article-2165277/Scientists-offer-1-000-prize-answer-question-Why-does-hot-water-freeze-faster-cold.html#ixzz1yyuizkU1

[Sonic Boom]

Hmmm. The hot water molecules are moving around a lot faster than the cold water molecules.....not sure where to go from there. Maybe transferring the cold temperature quicker?

[Rubik]

ENERGY! Huzzah! The molecules are moving quickly, so they have more energy than cold. So they go faster to group up.

[Fractured Silhouette]

Hmmm... I'll probably get this wrong, but hey ho.

The warmer the water gets, the more particles gain energy and move faster. Now, taking something hot and putting in a freezing cold environment will slow the particles down until they group and solidify. Now, if I remember my Chemistry classes properly (which I probably don't) hot stuff expands. Now the high energy molecules are moving at a faster rate than if they were cool, they collide a lot more, break apart and become gas if it gets too hot. Now, more particles will collide as the hot water is in the cold environment, it freezes when they stop, as the particles collide they slow down even more, causing a faster rate of cooling.

Bottom Line: The particles striking each other slow down faster because of their constant collision when they where warm. Causing a faster rate of cooling in hot water than in water of a cooler temperature.

You probably didn't understand that, but it made sense to me.

Also, this thread really made me think, more than what most of the threads in this section do. They're all ethical issues out there, this is the first scientific thread I've seen. Bravo.

[wild1]

The hojama microstapins align with the fruparis ion force causing warm water to freeze faster. Doesn't everybody know that?:yeah:

[Neverender]

Hot water contains more energy than Cold Water and therefore loses it's energy faster when exposed to a cold front, ultimately freezing

[Telkanis]

The hojama microstapins align with the fruparis ion force causing warm water to freeze faster. Doesn't everybody know that?:yeah:

Yup, I did! That's exactly it. Now let's collect the money and have a party :D

[ShatteredWings]

Bottom Line: The particles striking each other slow down faster because of their constant collision when they where warm. Causing a faster rate of cooling in hot water than in water of a cooler temperature.
This.

Does anyone else think scientists ignore obvious solutions that teenagers could find out so they can have more of these "shocking, new" discoveries on a slow news week?

[Neverender]

This.

Does anyone else think scientists ignore obvious solutions that teenagers could find out so they can have more of these "shocking, new" discoveries on a slow news week?

It's always been that obvious to me. I'm surprised this "challenge" even exists

[Cicero]

I don't know whether I should say my answer, cause you might claim the prize for yourself o_O
Well I will cause, I want to :D I believe it freezes faster, because the particles in the water are moving at a faster rate vs room temperature or refrigerated water.

[Heavyrain4life]

This.

Does anyone else think scientists ignore obvious solutions that teenagers could find out so they can have more of these "shocking, new" discoveries on a slow news week?

Yep.

[Professional Russian]

Im gonna try to be a genious for a second. To freeze hot water Quickly... Dry Ice. That is all

[Aves]

Im gonna try to be a genious for a second. To freeze hot water Quickly... Dry Ice. That is all

You do realize dry ice is carbon dioxide, not water?

[Professional Russian]

You do realize dry ice is carbon dioxide, not water?

wasnt the question the quickest way to freeze hot water?

[Aves]

wasnt the question the quickest way to freeze hot water?

Anyways, no, not dry ice. Dry ice actually evaporates in hot water creating a fog, which is how the create fogs during live performances. So no, not dry ice.

[Professional Russian]

Anyways, no, not dry ice. Dry ice actually evaporates in hot water creating a fog, which is how the create fogs during live performances. So no, not dry ice.

true but wouldnt it eventually freeze it?

[Erasmus]

true but wouldnt it eventually freeze it?

No, no it wouldn't.

[Puma_concolor]

Im gonna try to be a genious for a second. To freeze hot water Quickly... Dry Ice. That is all

wat

A better question: How we teach scientists to look for simple answers

[Professional Russian]

wat

A better question: How we teach scientists to look for simple answers

an even better questions how are they scientists if teenagers can figure it out?

[Puma_concolor]

an even better questions how are they scientists if teenagers can figure it out?

Because scientists think differently than most people. There's engineers that have trouble opening doors on subs because it's so simple, but they think of things on a whole new level of complicated.

[huginnmuninn]

Because scientists think differently than most people. There's engineers that have trouble opening doors on subs because it's so simple, but they think of things on a whole new level of complicated.

or maybe because although some answers may seem logical they are wrong.