SLec2 - Lecture 2: Ideal Gas Law We have briefly introduced...

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Lecture 2: Ideal Gas Law We have briefly introduced state variables that unambiguously characterize equilibrium states of our system , but they do NOT describe the history of the system (how it came to these states). Let us describe some simple systems using state variables. Example 1 : Consider an idealistic system with one particle (atom) in a box. The change of its momentum associated with scattering its from the wall is Δ p = 2mv . This event takes part once in Δ t = 2a/v , where a is the length of the box. Thus the average force with which the atom acts on the walls is: The resulting pressure is so that where E kin is the kinetic energy of the atom.
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Example 2 : Consider now that a cylinder of height h with a liquid of density d is placed in a gravitational field. The mass of the liquid is M = Vd = hAd, so the force acting on the bottom of the cylinder, , gives the pressure of This results can be used to measure pressure P in a device called manometer: The difference in heights of the liquid in the two arms
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This note was uploaded on 09/23/2010 for the course CHEM 342 taught by Professor Prestonsnee during the Spring '08 term at Ill. Chicago.

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SLec2 - Lecture 2: Ideal Gas Law We have briefly introduced...

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