Whats going on in this video with the water ?

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When hot water is thrown into extremely cold air, it rapidly evaporates and freezes into tiny ice crystals due to the increased surface area and cooling rate from dispersion. The low humidity at -45°F contributes to faster evaporation. Interestingly, experiments show that hot water can freeze faster than cold water under certain conditions, a phenomenon known as the Mpemba effect, though the reasons behind it are complex and involve various factors. The discussion highlights the intricate relationship between temperature, evaporation, and freezing processes. Overall, the behavior of hot water in cold environments is influenced by multiple interacting factors.
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ok so this guy throws up a cup of hot water at like 45 below zero F. And I am 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.
 
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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.
 
cragar said:


ok so this guy throws up a cup of hot water at like 45 below zero F. And I am 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.
 
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So there is some evaporation, because it disperses very quickly. Thanks for responding by the way .
 
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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.
 
James Leighe said:
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
 
G037H3 said:
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).
 

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