First slide
Work done by gas

A thermodynamic system undergoes cyclic process ABCDA as shown in figure. The work done by the system in the cycle is



In a cyclic process work done is equal to the area under the cycle and is positive if the cycle is clockwise and negative if anticlockwise. 

As is clear from figure, WAEDA=+ area of AED=+12P0V0 WBCEB=-Area of BCD=-12P0V0

The network done by the system is


=+12P0V0-12P0V0= zero 


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