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Lec39 - Lecture 39 Friday Chapter 19 The First Law of...

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Lecture 39 Friday 12/4/09 Chapter 19: The First Law of Thermodynamics, cont’d. Ideal Gas Processes Internal energy of ideal gas : U = nC V T , ± U = nC V ± T -- U only depends on the T of the gas, not V -- Isochoric (constant V ) process -- Adiabatic ( Q = 0) process -- Isothermal (constant T ) process -- Isobaric (constant p ) process Ratio of heat capacities ² = C p / C V Cyclic process : ± U = ± p = ± V = ± T = ± n = 0 -- ± U = Q ³ W = 0, so Q = W -- W = net area inside the cycle on a p-V diagram
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