Application: Mollier diagrams
Using this diagram as a starting point, how do I construct a similar U – T diagram?
From above plot:
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Now use f1 and f2 to construct table of P at each V & T
Now plot:
1) 
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Finally:
Substitute:
Constant P
Also:
Constant T
Using both in
3):
Everything is in terms of P, V, T!
Integrate w. r. t. T & P to find U!
Using data provided in original plots we can generate U – T plot.
What if we don’t have comprehensive data?