Relative Humidity and Absolute Humidity!
Discussion
So I understand (more or less) RH and Dew Point etc.
But I want to understand how RH changes when you have a fixed amount of water vapour at a fixed atmospheric pressure and you change the temperature. I can't seem to find anything on it, but it may be because I am not using the correct search terms.
For example, a volume of air has 50% RH at 25C then what would the RH be at say 20C apart from "higher".
Anyone got a formula I can use please?
But I want to understand how RH changes when you have a fixed amount of water vapour at a fixed atmospheric pressure and you change the temperature. I can't seem to find anything on it, but it may be because I am not using the correct search terms.
For example, a volume of air has 50% RH at 25C then what would the RH be at say 20C apart from "higher".
Anyone got a formula I can use please?
Just Google psychometric charts. Plenty of info on wiki how to read them etc. No need for calculating it yourself!
https://en.m.wikipedia.org/wiki/Psychrometrics
https://en.m.wikipedia.org/wiki/Psychrometrics
Edited by 200Plus Club on Saturday 28th October 23:26
+1, look at a psychometric chart - example in SI units: http://eon.sdsu.edu/testhome/Test/solve/basics/tab...
Pick a line of constant temperature, water content ('mixing ratio' - teh nearly-vertical grey lines overlaid) or enthalpy to see how the values change relative to the constant(s) you've picked.
It's not a thing described by a single equation!
Another good word to understand: 'adiabatic'...
Pick a line of constant temperature, water content ('mixing ratio' - teh nearly-vertical grey lines overlaid) or enthalpy to see how the values change relative to the constant(s) you've picked.
It's not a thing described by a single equation!
Another good word to understand: 'adiabatic'...
Edited by Huff on Sunday 29th October 00:34
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