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Unformatted text preview: Chapter 4 Summary One of your classmates was ill last week, so I thought I would send out this summary of the Chapter 4 lecture to everyone. He asked for any Powerpoint Presentations. Since I just used the board, I created this summary, focusing on the W OUT in a closed system Q IN- W OUT = ∆ E = ∆ U + ∆ KE + ∆ PE. If velocity and elevation are not an issue, Q IN- W OUT = ∆ U Further focusing on W OUT = 1) If the system stays at constant volume dV = 0 so W OUT = 0 2) If the system stays at constant Pressure, becomes P *(V 2- V 1 ) which is the area under the curve on a P-V diagram ∫ 3) If the system stays at constant temperature and the gas behaves ideally, = R*T * = R*T *ln(V 2 /V 1 ), because P*V = R*T and P = R*T /V. Again, the area under the curve on a P-v diagram . 4) If the system behaves polytropically, P 1 *V 1 n = P 2 *V 2 n = constant = C. n defines the shape of the parabola between states 1 and 2 and is a function of the gas behavior, which will be defined shortly. parabola between states 1 and 2 and is a function of the gas behavior, which will be defined shortly....
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- Spring '09
- Thermodynamics, specific heats, Wout