Lecture5-Thermo2_firstlaw

Lecture5-Thermo2_firstlaw - dw> 0 – work is being...

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MPO 551: Lecture 5 Thermodynamics First Law of Thermodynamics (Chapter 3, Wallace and Hobbs)
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Outline Conservation of energy Work and heat Specific heats/enthalpy Adiabatic processes
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Maxwell Boltzman distribution: ‘it also contains internal energy due to the kinetic and potential energy of its molecules or atoms. Increases in internal kinetic energy in the form of molecular motions are manifested as increases in the temperature of the system, whereas changes in the potential energy of the molecules are caused by changes in their relative positions by virtue of any forces that act between the molecules’ (Wallace and Hobbs)
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Unformatted text preview: dw > 0 – work is being done *by* the system and therefore the internal energy goes down Can then be rewritten as: Specific heats: Constant volume Joules law: internal energy of a gas only depends on temperature If v is constant, dq=du This is still not a very useful form so…. . Specific heats: Constant pressure When a system is heated but allow to expand, work is done by the system so more heating is needed to raise the same dT Where dq dh dp Dry static energy You can show this For adiabatic processes: Potential temperature:...
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