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View Full Version : Whats going on in this video with the water ?

cragar
Oct2-10, 01:15 AM
http://www.youtube.com/watch?v=LwobvxK5ulc

ok so this guy throws up a cup of hot water at like 45 below zero F. And im not sure what exactly is going on . Does the water first evaporate really fast and then freeze into tiny ice crystals. When its really cold outside the humidity is really low, so does stuff evaporate really quickly.
cragar
Oct3-10, 04:27 AM
This isn't that hard of a question, I am just asking what will happen to hot water when i throw it in the air at -45F.
Dadface
Oct3-10, 06:43 AM
http://www.youtube.com/watch?v=LwobvxK5ulc

ok so this guy throws up a cup of hot water at like 45 below zero F. And im not sure what exactly is going on . Does the water first evaporate really fast and then freeze into tiny ice crystals. When its really cold outside the humidity is really low, so does stuff evaporate really quickly.

Hello cragar.Throwing the water breaks it into smaller drops and increases the rate of cooling.I think your answer is right.
cragar
Oct3-10, 05:58 PM
So there is some evaporation, because it disperses very quickly. Thanks for responding by the way .
James Leighe
Oct5-10, 02:31 AM
I would like to see the same thing with cold water to see if there is any difference.

If you put a cup of hot water and a cup of cold water in a freezer the cup with hot water will freeze first... (I don't remember why exactly) So there are some hard to guess effects that can happen.
G037H3
Oct5-10, 02:39 AM
I would like to see the same thing with cold water to see if there is any difference.

If you put a cup of hot water and a cup of cold water in a freezer the cup with hot water will freeze first... (I don't remember why exactly) So there are some hard to guess effects that can happen.

heat=level of molecular activity

hot things react more with their environment
James Leighe
Oct5-10, 02:57 AM
heat=level of molecular activity

hot things react more with their environment

But they soon cool down to react just as much as the cold stuff would... And the cold stuff would already have a head start so it's not quite so simple. I think the reasons turned out to be fairly involved (multiple small effects added together).