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I have this graph of a gas:

gas graph

Now, I need to calculate work of it, based on ABCD cycle of changes (that's a bit confusing to me, do I calculate AB, BC, CD separately?). How do I do it?

Also, how can I calculate heat of this gas needed to exchange with enviroment, in order to maintain it's internal energy?

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closed as too localized by Alfred Centauri, Qmechanic Jun 22 '13 at 21:07

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Have you tried using the definition of the work done by a gas? http://www.ux1.eiu.edu/~cfadd/1150/14Thermo/work.html

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Thank you. That helped me alot. :) –  ojek Jun 22 '13 at 20:09
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