Whats going on in this video with the water ?

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  • Thread starter Thread starter cragar
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Discussion Overview

The discussion revolves around the behavior of hot water when thrown into extremely cold temperatures, specifically at -45°F. Participants explore the processes of evaporation and freezing, as well as the potential differences between hot and cold water in similar conditions.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • Some participants suggest that throwing hot water into the air causes it to evaporate quickly before freezing into tiny ice crystals, influenced by low humidity.
  • One participant notes that the dispersion of water into smaller drops increases the rate of cooling.
  • There is curiosity about the behavior of cold water under the same conditions, with a mention of the Mpemba effect, where hot water may freeze faster than cold water under certain circumstances.
  • Participants discuss the relationship between heat and molecular activity, suggesting that hot water interacts more with its environment but may cool down quickly.
  • Some express uncertainty about the underlying reasons for the observed phenomena, indicating that multiple small effects may contribute to the outcomes.

Areas of Agreement / Disagreement

Participants express a variety of viewpoints regarding the behavior of hot versus cold water, with no consensus reached on the exact mechanisms or outcomes involved in the process.

Contextual Notes

There are unresolved questions regarding the specific effects of evaporation and freezing, as well as the influence of molecular activity on the outcomes. The discussion lacks definitive conclusions about the comparative behavior of hot and cold water.

Who May Find This Useful

This discussion may be of interest to those exploring thermodynamics, phase changes, or the Mpemba effect in the context of physics and environmental science.

cragar
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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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