# Reference for phase diagrams of elements [duplicate]

I am trying to answer this question:

What is the pressure inside a sealed container with liquid nitrogen at room temperature?

Can you help me find a good online reference for phase diagrams. I am especially interested in pure elements, and diatomic gasses.

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First thing I do is type "phase diagram of <stuff>" into google. –  dmckee Jun 4 '12 at 19:33
@dmckee: Off cause that was the very first thing I tried - no luck. –  Hans-Peter E. Kristiansen Jun 4 '12 at 19:36
When I did I found a Wolfram alpha result which shows that $\mathrm{N}_2$ is above it's critical point at room temperature, so there isn't really an answer (there is no "liquid" as such, just dense fluid at whatever pressure you can maintain). –  dmckee Jun 4 '12 at 19:40
@dmckee: Thanks - I will have a close look at this page. –  Hans-Peter E. Kristiansen Jun 4 '12 at 19:43
@dmckee: Can you answer what the pressure inside a container, filled with liquid nitrogen, sealed, and then heated to room temperature will be? Maybe I should post it as separate question!? –  Hans-Peter E. Kristiansen Jun 4 '12 at 19:45