Has a phase diagram for hydrogen fluoride been published in an article on the internet or in a book ?

Or is there a table for HF for different pressures up to 100 atm. and temperatures up to 500$⁰$ C ?

Or, even better, is there a calculator for HF, like this one for steam ?

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    $\begingroup$ I checked Reaxys but couldn't really find anything on it. If I find some time I could check the Gmelin in our library tomorrow, they might have it. $\endgroup$ Feb 2, 2020 at 14:04
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    $\begingroup$ Might be offtopic here but of course there is an interesting difference as HF is the only common acid that will form H-bonding bridges to itself rather than to water. Still the H-bonding donating and accepting effects are different for H2O and HF which leads to different properties. But I'll check tomorrow. $\endgroup$ Feb 2, 2020 at 14:48
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    $\begingroup$ Why on Earth are you interested in HF to 100 atm. and at 500°C ? HF is such a dangerous compound.. Who would like to heat up to 500°C a sample of gaz like HF compressed to 100 atm ? $\endgroup$
    – Maurice
    Feb 2, 2020 at 15:04
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    $\begingroup$ @Maurice I can imagine you wondered ! I would like to investigate if HF could be a usefull lifting gas in the atmosphere of Venus with temperatures up to 462$⁰$ C and pressures up to 92 atm. $\endgroup$
    – Cornelis
    Feb 2, 2020 at 15:10
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    $\begingroup$ Sounds like a terrible idea anyway. Normal air is enough of a lifting gas out there. $\endgroup$ Feb 2, 2020 at 15:28

1 Answer 1


Linde Gas contains a vapor pressure curve. Note that this does not extend to Venusian surface temperatures which are above the critical point.

Hydrogen fluoride may not lift as well as you think. Its gas phase may associate through hydrogen bonding so molecules could be heavier than just HF. See the note near the end of the safety information here and note that the association could persist to higher temperature if you apply higher HF pressure than one atmosphere.

  • $\begingroup$ Thank you, this was exactly what i was looking for ! Made an edit but couldn't identify the word "peesust"! $\endgroup$
    – Cornelis
    Feb 3, 2020 at 9:22

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