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Why does hot water freeze faster?


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#16    Englishgent

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Posted 01 July 2012 - 01:51 AM

View PostChumpy8, on 30 June 2012 - 10:04 PM, said:

Hey GOOD question. I wish I could answer it, but our refridgerator broke down last week, so I won't be able to give you an answer until it gets fixed next week. My question to you is
"How many days can a beef patty stay fresh for?"
I guess the answer to this question will have to be a work-in-progress. But while I'm waiting I might take "ealdwita's" advice and paint the fridge.

Just dont climb inside the fridge to paint it. Remember, fridges are portals to other universes! :)


#17    Habitat

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Posted 01 July 2012 - 02:29 AM

This is bulldust. Hot water freezes quicker than cold water ? Cold water boils sooner than hot water ? Bah, humbug !


#18    Englishgent

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Posted 01 July 2012 - 02:47 AM

View PostHabitat, on 01 July 2012 - 02:29 AM, said:

This is bulldust. Hot water freezes quicker than cold water ? Cold water boils sooner than hot water ? Bah, humbug !

Cold water doesn't boil faster than hot water :)


#19    devilmaycare

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Posted 01 July 2012 - 06:52 PM

Because the molecules are moving faster and so the phase change is quicker. As I like to say, "it's in a hurrier". I have no idea. why?

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#20    odiesbsc

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Posted 01 July 2012 - 11:39 PM

This is all an old wives tale. Hot water does NOT freeze faster than cold water. I retired from the commercial refrigeration and electrical business and I do know a thing or two about heat transfer.

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#21    Myles

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Posted 02 July 2012 - 11:09 AM

I guess this can all be tested easily enough.


#22    odiesbsc

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Posted 02 July 2012 - 08:42 PM

My wife asked me about that, many years ago, so I boiled some water and put it in an ice cube tray and put cold water in another one then put em' in the freezer at te same time. The cold water froze much faster.

As you slide down the water slide of life, may none of your swimming suits give you a permanent wedgie.

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#23    diablo_04

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Posted 02 July 2012 - 11:45 PM

View Postodiesbsc, on 02 July 2012 - 08:42 PM, said:

My wife asked me about that, many years ago, so I boiled some water and put it in an ice cube tray and put cold water in another one then put em' in the freezer at te same time. The cold water froze much faster.
are you sure, I mean read the link.
the science world don't depute the clam, but they are not sure why is hot water freezing faster.
If one of you know why, send your explanation with facts and maybe you'll won a 2000$ -10% to me.

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#24    magnoliaReverie

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Posted 03 July 2012 - 12:41 AM

This reminds me...I need to make ice cubes. May as well test it out. :lol:


#25    Bavarian Raven

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Posted 03 July 2012 - 01:24 AM

does anyone else think they might be posting this to see if there IS a way to make hot water freeze faster then cold water?


#26    magnoliaReverie

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Posted 03 July 2012 - 03:42 AM

Cold water won by the way, don't ask me how or why though. At least now I have ice. :D


#27    Delovely5150

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Posted 03 July 2012 - 08:22 AM

So what happens to people when they're bored? They make Delovely laugh! *Marks check on her list and moves on to the next* Posted Image

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#28    Scepticus

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Posted 03 July 2012 - 09:49 AM

Okay to put this to rest.

The Mpemba effect isn't always observed, sometimes it is and sometimes it isn't. That is why scientists puzzle over this.

My guess would be that it has something to do with dissolved gas.

:D

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#29    aztek

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Posted 06 July 2012 - 02:02 PM

it doesn't.
anyone tried it????
i did.

it has to be a bit warmer than cold sample.
i have tried it few times, same cups with same amount of water, WARMER water freezes faster, not hot water.
in my experements, i used cold water from faucet, and same amount of the same water that has been sitting in the room for few hours, and was at room temp. NOT HOT.

don't believe me? try it yourself.

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#30    StevenM Arizona

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Posted 31 July 2012 - 07:40 AM

The longer that water remains at a constant temperature, the more hydrogen bonds and water clusters are subsequently formed between the water molecules. Water at a near boiling temperature has highly excited molecules, which effectively prevents the formation of clusters and intermolecular hydrogen bonding. Thus, to create the organized lattice structure of ice, hot water has fewer clusters and hydrogen bonds to break than does cooler water.
A useful real life analogy in visualizing the organization of liquid water molecules into a solid lattice is what I call the lifeboat model. Consider hot water to be represented by active people on a cruise ship, walking all decks randomly throughout the ship. Cool water, with its water clusters and hydrogen bonding, is represented by meal time where some of the guests are seated in an organized fashion at their tables, while others are at various parts of the ship.
If a command was given to immediately fill all of the lifeboats (form ice), the model in which the dining guests are organized and contained in one location would theoretically take longer to disassemble their structure and rearrange into the boats than the model in which the guests are already moving about randomly, unencumbered by any given structure.
Thus, the reason that hot water freezes more quickly than cooler water is that hot water, with its excited molecules, has fewer hydrogen bonds and corresponding clusters than cooler, more organized water.





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