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Boundary Work
 W_{b} = W_{fric} + W_{atm} + W_{crank}
 Area under a PV curve is boundary work

Work done during cycle
Difference of work done by the system and on the system

Boundary work with const. temp
 assuming ideal gas

polytropic process
 expansion and compression of gases
 PV^{n}= constant
 n = 0, const. P
 n = infinity, const. V
 n = 1, isothermal/ideal gas
 n = k = C_{p}/C_{v}, adiabatic/idel gas

Boundary work of polytropic process

First Law for a cycle
 Q_{net}  W_{net} = deltaU, where U is zero
 > Q_{net} = W_{net}

