Mirrors would fog up if i didnt turn the fan on

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SUMMARY

The discussion centers on the phenomenon of mirror fogging in bathrooms due to high humidity from hot showers. When the mirrors are below the dew point, water vapor condenses into liquid water, causing fog. The fan effectively mitigates this issue by reducing humidity levels by expelling moist air and drawing in drier air from the surrounding environment. This process is crucial for maintaining visibility in bathrooms during and after showers.

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  • Understanding of dew point and condensation
  • Basic knowledge of humidity and its effects on air quality
  • Familiarity with ventilation systems and their functions
  • Awareness of thermal dynamics related to temperature changes
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  • Research the principles of dew point and its calculation
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  • Explore humidity control techniques in residential spaces
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This discussion is beneficial for homeowners, HVAC professionals, and anyone interested in improving indoor air quality and managing humidity levels effectively.

nacho-man
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Hi guys,
Recently i had noticed that when i left the hot water in the shower on for a while, the mirrors would fog up if i didnt turn the fan on, so what I am wondering is how is it that the fan can prevent the windows from fogging up, I am assuming the windows fog up because of water vapor but I'm not to sure.
Thanks,
Nacho
 
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The mirrors fog up because they are below the temperature you have to cool water vapour to in order for it turn back into liquid water (called the dew point).
This depends on the temperature and the relativity humidty - at higher humidity you don't have to cool as much in order to get water forming.
The fan lowers the humidity by removing wet air and sucking in dry air from the rest of the house.
 


thanks mgb_phys
 

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