Making ice with warm / hot water
21 May 2003, 04:15 PM
#1
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Although I haven't performed an experiment, I'm told that if you put warm water into an ice-tray in the freezer, it'll make ice cubes quicker than if you use cold water.
Nobody can tell me why though.
Any ideas ?
Cheers,
N
Nobody can tell me why though.
Any ideas ?
Cheers,
N
21 May 2003, 04:18 PM
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don't see how that makes sense, more "work" for the freezer to do. i.e. if you put in really cold water then it shouldn't take too long to freeze?
21 May 2003, 04:25 PM
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Don't always use common sense when thinking about science 
http://www.sciencenet.org.uk/databas...l/c00024d.html
Stefan
http://www.sciencenet.org.uk/databas...l/c00024d.html
Stefan
21 May 2003, 04:27 PM
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Someone mentioned something similar to me before when clearing ice/snow from your car. They said if you use warm water, it will re-freeze faster than cold. Guess they have a point, although cold water won't do much to clear the ice/snow in the first place
Stefan
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21 May 2003, 04:53 PM
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Math... MIT speak for the English 'Maths' (one of my doctorates is from MIT)
Moveable feast... as in feast days, like Easter, that fall on different days each year unlike others like December 25th... (X-mas)
Collins dictionary definition of 'math' :-
US/Canadian to Brit. 'Maths'
[Edited by Mycroft - 5/21/2003 4:57:43 PM]
Moveable feast... as in feast days, like Easter, that fall on different days each year unlike others like December 25th... (X-mas)
Collins dictionary definition of 'math' :-
US/Canadian to Brit. 'Maths'
[Edited by Mycroft - 5/21/2003 4:57:43 PM]
- Mycroft works for the Murder Investigation Team
21 May 2003, 05:17 PM
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It works a bit like the way wind works. If air at very high pressure gets near to a very low pressure, the air movement will be very rapid. If the two pressures are similar, the movement will be slow.
Relate this to temperature and this is why warm water can freeze quicker than cold: the temperature differantial speeds up the process.
Or summink.
Relate this to temperature and this is why warm water can freeze quicker than cold: the temperature differantial speeds up the process.
Or summink.
21 May 2003, 05:28 PM
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NRev, yep, thanks, we're all up to speed there.
I'm just curious as to what new Law of Physics Mycroft is going to astound us with. And which doctorate/PhD/Nobel Peace Prize he has which includes it. Still, they say you never stop learning..!
I'm just curious as to what new Law of Physics Mycroft is going to astound us with. And which doctorate/PhD/Nobel Peace Prize he has which includes it. Still, they say you never stop learning..!
21 May 2003, 05:36 PM
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ok,
why then can I take a niceley chilled bottle of stella from the freezer - open it and it freezes up in 2 minutes - not solid, but thick slush.
I think I know the answer, anyone else.
if Ed Harris were here he'd say it was a phenomenon...
why then can I take a niceley chilled bottle of stella from the freezer - open it and it freezes up in 2 minutes - not solid, but thick slush.
I think I know the answer, anyone else.
if Ed Harris were here he'd say it was a phenomenon...
21 May 2003, 05:49 PM
#24
ozze:Someone mentioned something similar to me before when clearing ice/snow from your car. They said if you use warm water, it will re-freeze faster than cold. Guess they have a point, although cold water won't do much to clear the ice/snow in the first place
21 May 2003, 05:56 PM
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I hadn't thought of that TBH, I reckon its to do with pressure.
the contents of the bottle are cold enough to freeze, but because the contents of the bottle are under pressure the liquid cannot expand enough to change state.
when you pop the cap off, the contents are back at atmospheric pressure and all the little water molecules go - "**** me it's cold - we'd better turn to ice quick" - and they do, because the lack of pressure around them permits.
However, it's not beyond the realms of possibility that I am talking out of my bottom.
the contents of the bottle are cold enough to freeze, but because the contents of the bottle are under pressure the liquid cannot expand enough to change state.
when you pop the cap off, the contents are back at atmospheric pressure and all the little water molecules go - "**** me it's cold - we'd better turn to ice quick" - and they do, because the lack of pressure around them permits.
However, it's not beyond the realms of possibility that I am talking out of my bottom.
21 May 2003, 06:01 PM
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when water gets hot the molecules expand to a state where they disperse to form a gas - agreed?
Why then, when water gets cold,do the moecules also expand to form ice - you would think it would be the other way round, i.e they contract.
I can see me having another sleepless night with this one.
Why then, when water gets cold,do the moecules also expand to form ice - you would think it would be the other way round, i.e they contract.
I can see me having another sleepless night with this one.
