chapter12.1_12.2_slides

chapter12.1_12.2_slides - 11/17/2009 Chapter 12 The Laws of...

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11/17/2009 1 Chapter 12 The Laws of Thermodynamics Two ways for transferring energy to a system - heat (conduction, convection, radiation, Chapter 11.5) - work Energy transferred by work: Compress a cylinder of gas D V: Change in gas volume P: pressure of gas Gas container with With piston ) ( i f y y F W y F PA F y PA D V P W D
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11/17/2009 2 Work done on a gas: If volume does not change, work is zero If volume shrinks ( D V <0), external force does positive work If volume expand, external force does negative work - gas does positive work to its environment The above equation works only for work done on a gas with a constant pressure called isobaric process If the pressure is not a constant, we may use the PV diagram to calculate the work V P W D V P W env D Pressure vs volume graph is called a PV diagram The area under the PV diagram is equal in magnitude to the work done on the gas - if D V=V f
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chapter12.1_12.2_slides - 11/17/2009 Chapter 12 The Laws of...

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