# Reference for phase diagrams of elements [duplicate]

This question already has an answer here:

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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## marked as duplicate by Qmechanic♦Mar 1 '13 at 23:48

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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

## 1 Answer

Your question only makes sense if you ask

At which pressure are liquid and gaseous phase of nitrogen at equilibrium at room temperature?

The answer is none, as critical temperature of nitrogen is far below room temperature, at about 126 K.

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I am sorry, I've only seen dmckee's comment now. Maybe dmckee should post his answer too so you could accept it. –  Pygmalion Jun 4 '12 at 20:44