Thermo

# Thermo - Ch 19 The First Law of Thermodynamics Liu UCD...

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Liu UCD Phy9B 07 1 Ch 19. The First Law of Thermodynamics

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Liu UCD Phy9B 07 2 19-1. Thermodynamic Systems Thermodynamic system: A system that can interact (and exchange energy) with its surroundings Thermodynamic process: A process in which there are changes in the state of a thermodynamic system Heat Q added to the system Q>0 taken away from the system Q<0 (through conduction, convection, radiation) Work done by the system onto its surroundings W>0 done by the surrounding onto the system W<0 Energy change of the system is Q + (-W) or Q-W Gaining energy: +; Losing energy: -
Liu UCD Phy9B 07 3 19-2. Work Done During Volume Changes Force exerted on the piston: F=pA Infinitesimal work done by system dW=Fdx=pAdx=pdV Work done in a finite volume change Area: A Pressure: p = final initial V V pdV W

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Liu UCD Phy9B 07 4 Graphical View of Work Gas expands dV>0, W>0 Gas compresses dV<0, W<0 Constant p W=p(V 2 -V 1 )
Liu UCD Phy9B 07 5 19-3. Paths Between Thermodynamic States Path: a series of intermediate states between initial state ( p

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## This note was uploaded on 02/17/2009 for the course PHY na taught by Professor Richardscalettar during the Spring '09 term at UC Davis.

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Thermo - Ch 19 The First Law of Thermodynamics Liu UCD...

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