L5 - Work in Thermodynamic Processes

L5 - Work in Thermodynamic Processes - PH2103 Thermal...

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PH2103 Thermal Physics Lecture 5: Work in Thermodynamic Processes Massimo Pia Ciamarra [email protected] SPMS-PAP-03-14 Textbook paragraph: 1.5 Discussion Forum
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1. Work in thermodynamic processes Work done on a gas PV diagram 2. Notable transformations Isocoric Isobar Agenda
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1. Work in Thermodynamic Processes Work done on a gas
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Note: quasistatic transformations We will consider the amount of heat and work required to change the thermodynamic state of a system. E.g. to change its pressure, volume and/or temperature. In doing so we assume the validity of the ideal gas low. we assume the transformation to be extremely slow, so slow that the system has time to reach the equilibrium condition before parameters are further varied. These transformation are known as quasistatic transformations. They are a good approximation of actual ones.
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Work Done on a Gas Consider a system of gas in thermodynamic equilibrium (every part of the gas is at the same T and P)
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Work Done on a Gas Adding heat Q can: Change temperature Change state of matter Change of ΔU (Internal Energy) Consider a system of gas in thermodynamic equilibrium (every part of the gas is at the same T and P)
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Work Done on a Gas Adding heat Q can: Change temperature Change state of matter Can also change ΔU by doing work on the gas Change of ΔU (Internal Energy) Consider a system of gas in thermodynamic equilibrium (every part of the gas is at the same T and P)
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Work and PV Diagram (P=const.) The pressure of the gas is assumed to remain constant during expansion or compression: isobaric process W on gas   P ( V final V initial )
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Work and PV Diagram (P=const.) The work done on the gas equals the area under the graph in the PV diagram The pressure of the gas is assumed to remain constant during expansion or compression: isobaric process W on gas   P ( V final V initial )
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Generally, pressure may not be constant.
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