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# Lect30 - PHY101 Lecture 30 Thermodynamics q q Ne m rial...

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Physics 101: Lecture 30, Pg 1 PHY101: Lecture 30 PHY101: Lecture 30 Thermodynamics Thermodynamics New material: Chapter 15 The dynamics of thermal processes (equilibrium, work, energy)

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Physics 101: Lecture 30, Pg 2 The Ideal Gas Law The Ideal Gas Law (review) (review) P V = N k B T N = number of molecules » N = number of moles (n) x N A molecules/mole k B = Boltzmann’s constant = 1.38 x 10 -23 J/K P V = n R T R = ideal gas constant = N A k B = 8.31 J/mol/K
Physics 101: Lecture 30, Pg 3 Summary of Kinetic Theory: Summary of Kinetic Theory: The relationship between energy and temperature The relationship between energy and temperature (for monatomic ideal gas) (for monatomic ideal gas) T k 2 3 v m 2 1 e KE/molecul ave B 2 = = μ 3RT M T 3k v v B 2 rms = = = Internal Energy U = number of molecules x ave KE/molecule = N (3/2) k B T = (3/2) n RT = (3/2) P V (ideal gas) Careful with units: R = 8.31 J/mol/K μ = molar mass in kg/mol v rms = speed in m/s Root-mean-square speed :

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Physics 101: Lecture 30, Pg 4 Thermodynamics Thermodynamics Dynamics of thermal processes, i.e. when a system interacts with its surroundings via thermal processes : system surroundings P,V,T The state of the system (e.g. gas) is determined by P,V and T. Example: gas filled container with piston on open end of container: system = gas at pressure P and temperature T and volume V surroundings = piston and walls of container
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Lect30 - PHY101 Lecture 30 Thermodynamics q q Ne m rial...

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