How would I calculate the pressure that would form if I dumped liquid helium into a pressure vessel and closed the lid?

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Ulrich Deiters

What is “ksi”? I never heard of such a pressure unit.

What is the temperature? It makes a lot of a difference whether your helium is at room temperature or liquid.

Ahmed Khalid Ibrahim

https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.govinfo.gov/content/pkg/GOVPUB-C13-0ddd394a9cd4d3d56652a31d6b8177f5/pdf/GOVPUB-C13-0ddd394a9cd4d3d56652a31d6b8177f5.pdf&ved=2ahUKEwjTzIDYj9_nAhUMuqQKHeMpDZYQFjAOegQICRAB&usg=AOvVaw0ST70ubsoXwupowTmPT8d1&cshid=1582167363632

Thank you for the literature! There is a new equation of state for helium in REFPROP (journal publication forthcoming). But I cannot say whether this meets your needs without still knowing your pressure and temperature range.

Ben Larson

Thank you for your responses. As stated by Matthis, ksi is equal to 1000 psi. My working temperature is room temperature, or 20C. I'm looking for an equation of state which takes into account super-critical fluids such as what helium and other gasses would be at those pressures.