Forget about the plane.. which freezes faster?

[aircooled]

http://math.ucr.edu/home/baez/physics/General/hot_water.html

 

[J0hnny]

Hot water. Many studies have already been done. We tested it in our heat transfer class as well. It's true, hot water does freeze faster.

 

[robisc]

Hot, I've tried it too.

 

[alien42]

Originally posted by: TheGoodGuy
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.

so much technical jargon yet owned by all the evidence available online :laugh:

 

[radioouman]

Originally posted by: dug777
the water under pressure of course, duh!

The water under negative pressure of course, duh!

 

[Kelemvor]

Reminds of of the mythbusters thing where they wanted to chill a beer and used Ice in a cooler, Ice with water, ice with water and salt, refrigerator, etc.

 

[Molondo]

Originally posted by: mchammer
ban

 

[marvdmartian]

Wait, I think I've got this figured out.......

Back when I was a kid, my mom had a refrigerator/freezer that didn't auto-defrost (yeah, I'm a old fart!). When she wanted to defrost it, she'd put a pan of boiling water in the freezer to help melt the ice buildup in the freezer.

But when she wanted ice cubes, she'd fill the tray with cold water.

So therefore, cold water freezes first, since hot water has to cool down to cold water before it can freeze........or something like that!! :laugh:

 

[Kelemvor]

Could just do a google search to get the answer too. Just like the idiot people in the plane question. But I guess it's more fun to let everyone type out big long posts telling why it is so the rest of us can laugh at them.

http://www.google.com/search?num=100&hl...eezes+first+hot+cold+water&btnG=Search
http://math.ucr.edu/home/baez/physics/General/hot_water.html

 

[archiloco]

Originally posted by: FrankyJunior
Could just do a google search to get the answer too. Just like the idiot people in the plane question. But I guess it's more fun to let everyone type out big long posts telling why it is so the rest of us can laugh at them.

http://www.google.com/search?num=100&hl...eezes+first+hot+cold+water&btnG=Search
http://math.ucr.edu/home/baez/physics/General/hot_water.html

SWEET!!! errr or i mean HOT!!! hehe

 

[sao123]

Originally posted by: blahblah99
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?

upon further review, it appears the plane will freeze faster than the cup of cold water.

 

[Rubycon]

Does the coolth value of the conditioned space approach infinity?

 

[Kelemvor]

Originally posted by: sao123

Originally posted by: blahblah99
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?

upon further review, it appears the plane will freeze faster than the cup of cold water.

But the Hot water will never move because the treadmill keeps it in place.

 

[arcenite]

I heard somewhere once that warm water will freeze faster than cool water... someone should try it and report back

 

[blahblah99]

Originally posted by: PurdueRy

Originally posted by: dxkj
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

without an act of god...the 33 degree one...its all based on temps though as you point out

Well, say cold would be your average refrigerator temp, warm would be room temp, and hot would be near boiling point.

 

[dainthomas]

This place we went out to last week puts all their beer frozen mugs so that you get massive chunks of ice floating in it. Here's a clue: good beer tastes better when it's not below zero.

Ice in my porter = Suck