Say you have a cup of hot water, a cup of warm water, and a cup of cold water and put all three into the freeer at the same time. Which one freezes faster?
Forget about the plane.. which freezes faster?
- Thread starter blahblah99
- Start date
Cold
After looking: It appears to depend on certain conditions that I don't care about
Insulation being taken into account, we can now attribute the hot water freezing first to the fact that, in hot water, circulation currents move faster, exposing more water to the air, and resultant evaporation (hence, cooling) occurs at a greater rate. Also, boiling the water before exposure to frigid temperatures removes the dissolved air which inhibits freezing in the colder water.
After looking: It appears to depend on certain conditions that I don't care about
Insulation being taken into account, we can now attribute the hot water freezing first to the fact that, in hot water, circulation currents move faster, exposing more water to the air, and resultant evaporation (hence, cooling) occurs at a greater rate. Also, boiling the water before exposure to frigid temperatures removes the dissolved air which inhibits freezing in the colder water.
Depends on how much water and how hot the hot water is. If it's hot enough so that a good enough amount will evaporate that'll be less water that has to freeze thereby the hot one would freeze first.
AbAbber2k
Diamond Member
- Mar 1, 2005
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Kind of what I was thinking.
A quick google search gives this... Does Hot Water Freeze Faster than Cold?
it seems like the hot water would drop faster.... but then again the cold water doesnt have to drop nearly as far
compare cold water being 33 degrees F, and hot water being 210 degrees F
hrmm.. which freezes first
compare cold water being 33 degrees F, and hot water being 210 degrees F
hrmm.. which freezes first
Soccerman06
Diamond Member
- Jul 29, 2004
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How bout the 33F water being cooled to 32 while the 210F is exposed to absolute zero, which one will freeze faster...
silverpig
Lifer
- Jul 29, 2001
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Um, this is stupidly easy.
Take three cups of water at different temperatures 1 deg C, 31 deg C, 61 deg C, all else being equal, and then put them in the freezer. Let's think about what happens:
The 61 degree water will cool quite quickly.... 60, 59, 58, 57, ... after some time here it'll get down to 33, 32, 31... Oh wait. It's now a cup of 31 degree water. It's now doing the exact same thing the originally 31 degree water did, but it's taken some time to get to where the second one started off.
Gist: Hot water takes some time to cool and becomes cool water before it freezes.
Take three cups of water at different temperatures 1 deg C, 31 deg C, 61 deg C, all else being equal, and then put them in the freezer. Let's think about what happens:
The 61 degree water will cool quite quickly.... 60, 59, 58, 57, ... after some time here it'll get down to 33, 32, 31... Oh wait. It's now a cup of 31 degree water. It's now doing the exact same thing the originally 31 degree water did, but it's taken some time to get to where the second one started off.
Gist: Hot water takes some time to cool and becomes cool water before it freezes.
but, as stated in the link.
water cools from the outside in, and thus will form a "skin" that is more insulating than hot...
now, the hot water should, freeze bottom up. thus, no skin forms.
water cools from the outside in, and thus will form a "skin" that is more insulating than hot...
now, the hot water should, freeze bottom up. thus, no skin forms.
Do you actually beleive that if you put a cup of hot water in the freezer, it's going to freeze from the bottom up? Have you never frozen water before? Do you make ice cubes?
That's what I would have thought. Given that most of us have water, cups, and a freezer, whereas most of us don't have a plane and a conveyor belt runway with isntantaneous speed sensing/adjustment abilities, at least we know that if this becomes heated, we can have conclusive proof.
I'm with silverpig though, this question seems stupid.
Cold.
Under very specific conditions, hot. -About a quarter of an inch of water on a cookie sheet is the only way to do it, really.
Under very specific conditions, hot. -About a quarter of an inch of water on a cookie sheet is the only way to do it, really.
is the container for all 3 are the same, the same amount of water is placed in each, and all 3 placed in the same place the cold water owuld freeze the fastest
the only way the hot water would freeze faster at the same amont int he same container is if it was so hott it evaporated, the evaportated water would freeze faster than the cold water
the only way the hot water would freeze faster at the same amont int he same container is if it was so hott it evaporated, the evaportated water would freeze faster than the cold water
The Stigenator
Lifer
- Oct 9, 1999
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assuming that all 3 are kept in identical containers and have same volume of water.
Cold will freeze first.
Why?
Well the amount of energy required for the change of state from liquid to solid (latent heat) is 80cal/gm
thats assuming water is above 4*C or 39F. Any degree over change of state will have to be factored in at 1cal/gm.
Now for boiling / hot water, you got latent heat of vaporization at 540cal/g and then you got to calculate at 1cal/g for the difference from 100*C to 4*C and then 80cal/gm for it to freeze.
So techinically cold water will freeze first.
Cold will freeze first.
Why?
Well the amount of energy required for the change of state from liquid to solid (latent heat) is 80cal/gm
thats assuming water is above 4*C or 39F. Any degree over change of state will have to be factored in at 1cal/gm.
Now for boiling / hot water, you got latent heat of vaporization at 540cal/g and then you got to calculate at 1cal/g for the difference from 100*C to 4*C and then 80cal/gm for it to freeze.
So techinically cold water will freeze first.
The Stigenator
Lifer
- Oct 9, 1999
- 15,216
- 3
- 81
assuming that all 3 are kept in identical containers and have same volume of water.
Cold will freeze first.
Why?
Well the amount of energy required for the change of state from liquid to solid (latent heat) is 80cal/gm
thats assuming water is above 4*C or 39F. Any degree over change of state will have to be factored in at 1cal/gm.
Now for boiling / hot water, you got latent heat of vaporization at 540cal/g and then you got to calculate at 1cal/g for the difference from 100*C to 4*C and then 80cal/gm for it to freeze.
So techinically cold water will freeze first.
Cold will freeze first.
Why?
Well the amount of energy required for the change of state from liquid to solid (latent heat) is 80cal/gm
thats assuming water is above 4*C or 39F. Any degree over change of state will have to be factored in at 1cal/gm.
Now for boiling / hot water, you got latent heat of vaporization at 540cal/g and then you got to calculate at 1cal/g for the difference from 100*C to 4*C and then 80cal/gm for it to freeze.
So techinically cold water will freeze first.
Soccerman06
Diamond Member
- Jul 29, 2004
- 5,830
- 5
- 81
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