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# Lecture19 - PHYSICS 231 INTRODUCTORY PHYSICS I Lecture 19...

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PHYSICS 231 INTRODUCTORY PHYSICS I Lecture 19

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First Law of Thermodynamics Work done by/on a gas Last Lecture Q = D U + W by the gas W by the gas = P D V = - W on the gas
Some Vocabulary Isobaric P = constant Isovolumetric V = constant W = 0 Isothermal T = constant U = 0 (ideal gas) Adiabatic Q = 0 V V V V P P P P

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P-V Diagrams P V Path moves to right: W by the gas = Area under curve P V Path moves to left: W by the gas = - Area under curve (W on the gas = - W by the gas )
Work from closed cycles W A->B->A = Area (work done by gas ) W A->B->A = -Area Clockwise cycle: Counterclockwise cycle: U = 0 in closed cycles

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Example 12.8a Consider an ideal gas undergoing the trajectory through the PV diagram. In going from A to B to C, the work done BY the gas is _______ 0. P V A B a) > b) < c) = C
Example 12.8b In going from A to B to C, the change of the internal energy of the gas is _______ 0. P V A B a) > b) < c) = C

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Example 12.8c In going from A to B to C, the amount of heat added to the gas is _______ 0. P V A B a) > b) < c) = C D
Example 12.8d In going from A to B to C to D to A, the work done BY the gas is _______ 0. P V A B a) > b) < c) = C D

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In going from A to B to C to D to A, the change of the internal energy of the gas is _______ 0. P
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Lecture19 - PHYSICS 231 INTRODUCTORY PHYSICS I Lecture 19...

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