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Chapter 12
The Laws of Thermodynamics
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Work in a Gas Cylinder
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PV Diagrams
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First Law of Thermodynamics What is first law of
thermodynamics? What does it do? What is the equation? How do I use it?
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First Law – Signs Signs of the terms in the equation
Q Positive if energy is transferred to the system by
heat Negative if energy is transferred out of the
system by heat W
Positive if work is done on the system Negative if work is done by the system
U Positive if the temperature increases Negative if the temperature decreases
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Molar Specific Heat
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Degrees of Freedom
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Isolated System
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Second Law of Thermodynamics What is the second law? What does it do? How do I use it?
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Types of Thermal Processes Isobaric
Pressure stays constant Horizontal line on the PV diagram
Isovolumetric Volume stays constant Vertical line on the PV diagram
Isothermal Temperature stays the same
Adiabatic No heat is exchanged with the surroundings
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Cyclic Processes
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Heat Engine
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Thermal Efficiency of a Heat Engine
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Heat Pumps and Refrigerators
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Reversible and Irreversible Processes
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Sadi Carnot 1796 – 1832 French Engineer Founder of the
science of thermodynamics
First to recognize the relationship between work and heat
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Carnot Cycle
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Example
How much work is done by an ideal gas in expanding isothermally from an initial volume of 3 liters at 20 atm to a final volume of 24 liters?
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ExampleYou have one and half hour before guest start arriving to your party when you suddenly realized that you forgot to buy ice for your drinks. You quickly put 1.0 L of water at 10 degree Celsius into your ice cube tray and pop them into the freezer. Will you have ice for your guest. The label on your refrigerator states that COP=5.5 and power rating 550W. Assume that only 10% of power contributes to freezing water.
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Example
Find the efficiency of an Otto cycle shown in the figure and express the answer in terms of the ratio R=Va/Vb.
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Entropy What is entropy?