Compressibility of gas

[Subcooled]

I am looking for density-pressure graphs for air, ean32 and tmx 21/35 in the 200-300 bar region. Does anybody have these? Graphs for O2, He and N2 would also do.

I want to compare 230 bar tanks to 300 bar tanks and for this I need to study the compressibility of gasses.

The relevant measure of oxygen consumption is the number of oxygen atoms (or molecules) per minute or equivalently the mass of oxygen used per minute. However, the same amount of added material (grams, atoms) may cause different pressure increase depending on initial pressure of the container. Adding gas to a container already at a high pressure becomes more and more inefficient. Beyond some point the "twice the pressure, twice the gas" -rule does not hold anymore. I don't have the tables.

 

[Redshift]

Google for van der Waals equation and the needed a and b parameters. Then you can plot it yourself but you'll probably easily find graphs.


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[Hickdive]

I'm not a mathematician (I have to take off my boots and socks to count to 20) however I believe what you're looking for is Van der Waal's equation;

Van der Waals equation - Wikipedia, the free encyclopedia

My understanding is that the ideal gas laws start to break down at 232 bar and Van der Waal accounts for this.

 

[Subcooled]

Thanks