How can I calculate relative humidity in helium?

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To calculate relative humidity in helium using dew point temperature, gas temperature, and gas pressure, the Magnus and Antoine equations can be considered, though the Antoine equation is noted for its imprecision. The discussion highlights the need for clarity on the conditions, such as whether the calculations pertain to cryogenic temperatures or standard temperature and pressure (STP). Additional resources, like a psychrometric chart for helium, are suggested for further guidance. The importance of accurate data and understanding the context of the variables is emphasized. Accurate calculations are crucial for applications involving helium's humidity.
Telefunken123
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Hello,
I want to calculate the relative humidity in Helium. I only have the variables "dew point temperature", "gas temperature" and "gas pressure". So I tried with Magnus and Antoine equation. But I read that the Antoine equation is very unprecise. So do you know how to calculate the relative humidity in Helium with these variables?

Best regards
Telefunken
 
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Telefunken123 said:
I only have the variables "dew point temperature", "gas temperature" and "gas pressure".
You do, we don't. Are we talking milliKelvin cryogenics or STP here ?
 
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