Lecture 29 - Lecture 29 pls-29.1 Temperature and Thermal...

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Lecture 29 pls-29.1 Temperature and Thermal Expansion Media: (1) Ring and ball bearing (2) Bimetallic strip 1. Thermodynamics and Statistical Mechanics Macroscopic Quantities *Temperature T Free Energies *—internal energy U —enthalpy H —Helmholtz energy A —Gibbs F.E. G Entropy S Pressure P *Heat Q Provides a microscopic basis for the macroscopic thermodynamic quantities (Recall discussions of ρ and P ) 2. Internal Energy (U), Temperature (T), and Heat (Q) Consider two identical objects, except one is “hot” and one is “cold” (Hot and cold refer to relative temperatures of the two objects.) U : total microscopic energy ( PE KE + ). An extensive quantity Æ scales with the size of the object. “hot” “cold”
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Lecture 29 pls-29.2 For 2 identical objects, the hotter one has more internal energy U . T : temperature is related to N U , where N = number of atoms or molecules in object. Generally, as U increases T increases. Typical graph: T is an intensive quantity ratio of 2 extensive quantities Æ T is independent of the size of the object. Q
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This note was uploaded on 03/26/2012 for the course PHY 1020 taught by Professor Kodera during the Fall '11 term at University of Florida.

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Lecture 29 - Lecture 29 pls-29.1 Temperature and Thermal...

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