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Unformatted text preview: Let us return once again to the standard model in thermodynamics: a gas in a cylinder with a piston . As will be derived in class, the work done by the gas in pushing the piston to a new location is given by, V f W out = ∫ P(V) dV , V i That is the area under the PV curve between V i and V f . The work is positive when the gas does work on the environment. If you heat the system then we take Q in >0. With this sign convention we write the first law of thermodynamics (conservation of energy) dE internal =dQ in – dW out , where again, Q in >0 heat the gas and W out >0 gas does work. This basic physics equation is one of the foundations of mechanical engineering. Thermodynamic Processes In class we define: Adiabatic Isothermal Cyclic Free Expansion Isobaric Isovolumetric EXAMPLES[in class]...
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 Spring '08
 Chen
 Physics, Thermodynamics, Energy, Law of Thermodynamics, Phase transition, phase transitions

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