Lecture22

# Lecture22 - Chapter 18 Temperature Heat and the First Law...

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Chapter 18 Temperature, Heat, and the First Law of Thermodynamics 1 PHYS 2101, P.M.Shikhaliev LSU, Fall 2010

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18.2. Temperature 2 PHYS 2101, P.M.Shikhaliev LSU, Fall 2010 Temperature of bodies is an indication of how fast atoms and molecules move in the bodies. In other words, temperature is a measure of kinetic energy of atoms and molecules in the bodies. T body = aK atom
18.3. The Zeroth Law of Thermodynamics If bodies A and B are each in thermal equilibrium with a third body T , then A and B are in thermal equilibrium with each other. 3 PHYS 2101, P.M.Shikhaliev LSU, Fall 2010 Thermoscope

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18.4. Constant Volume Gas Thermometer 4 PHYS 2101, P.M.Shikhaliev LSU, Fall 2010 mg p p 0 Measuring gas pressure with Hg U-tube: , , , , In this method the temperature is determined from the measured gas pressure.
18.4. Constant Volume Gas Thermometer 5 PHYS 2101, P.M.Shikhaliev LSU, Fall 2010 , When gas volume is constant, pressure linearly depends on temperature .

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18.4. Triple point cell 6 PHYS 2101, P.M.Shikhaliev LSU, Fall 2010 Triple point cell is an isolated volume that includes a pure water. At some temperature T 3 (which we call zero) water, ice, and water vapors coexist infinitely long. T 3 = 273.16 K = 0 C T 3 = 273.16 K = 0 C P = 0.006 atm Triple point cell
18.4. Measuring unknown temperature 7 PHYS 2101, P.M.Shikhaliev LSU, Fall 2010 1)Place gas-filled bulb in triple-point cell

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## This note was uploaded on 01/26/2011 for the course PHYS 2101 taught by Professor Grouptest during the Spring '07 term at LSU.

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Lecture22 - Chapter 18 Temperature Heat and the First Law...

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