jochhe1998
Active Member
Hey guys, so my questions is what is more important Absolute Humidity or Relative Humidity?
For those of you who don't know the difference here is a short breakdown.
- Absolute Humidity is the total mass of water vapor per volume (typically expressed in grams per cubic meter)
- Relative Humidity is expressed as the percentage of water mass that can be stored per volume of air at a specific temperature (see chart below)
![Absolute vs Relative Humidity Chart.png](/data/attachments/3847/3847515-9b78fc60448d5eebc3962f02230d0b7b.jpg)
Image 1: taken from https://socratic.org/questions/how-is-relative-humidity-related-to-the-dew-point
While this chart may not be terribly accurate it serves a general purpose.
Now, in terms of pest and fungal development, shouldn't absolute humidity be the measure by which growers go by? My thinking is that a fungus/mold/pest needs 'X' amount of water vapor to survive and procreate (could be wrong). Considering that the total amount of water at 100% humidity (20 C) is almost the same as 50% humidity (30 C) isn't RH (relative humidity) a pointless measure - especially considering most grow rooms experience 5 degree swings regularly?
All discussions are welcome but please state how you came to your conclusion!
Thanks for the help![Smile :) :)](/styles/smilies/icon_smile.gif)
For those of you who don't know the difference here is a short breakdown.
- Absolute Humidity is the total mass of water vapor per volume (typically expressed in grams per cubic meter)
- Relative Humidity is expressed as the percentage of water mass that can be stored per volume of air at a specific temperature (see chart below)
![Absolute vs Relative Humidity Chart.png](/data/attachments/3847/3847515-9b78fc60448d5eebc3962f02230d0b7b.jpg)
Image 1: taken from https://socratic.org/questions/how-is-relative-humidity-related-to-the-dew-point
While this chart may not be terribly accurate it serves a general purpose.
Now, in terms of pest and fungal development, shouldn't absolute humidity be the measure by which growers go by? My thinking is that a fungus/mold/pest needs 'X' amount of water vapor to survive and procreate (could be wrong). Considering that the total amount of water at 100% humidity (20 C) is almost the same as 50% humidity (30 C) isn't RH (relative humidity) a pointless measure - especially considering most grow rooms experience 5 degree swings regularly?
All discussions are welcome but please state how you came to your conclusion!
Thanks for the help
![Smile :) :)](/styles/smilies/icon_smile.gif)