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Unformatted text preview: Lecture 22 Equations of state. The ideal gas. Kinetic model of a gas. State variables State variables for a system: they characterize the system macroscopically at a given time. Pressure Temperature Volume Mass or moles Important: a system is in a thermal state that can be described by these variables when ALL the system has uniform pressure, temperature, etc. Example: Gas in a tube whose ends are kept at different temperature is NOT in a thermal state. Equation of state Can be obtained: Empirically From statistical mechanics The equation of state relates the state variables. The ideal gas An ideal gas is one whose molecules are very small (pointlike) do not interact with one another This is very true for any gas that is not in an extreme situation. The gas is NOT ideal if we have: high density high pressure near transition to liquid (or solid) molecules are very large The ideal gas state equation pV nRT = n = number of moles Ideal gas constant R = 8.31 J mol K What is mole?...
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 Summer '08
 B
 Mass

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