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chapter12

# chapter12 - Chapter12 SecondLawof Thermodynamics occur...

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Chapter 12 The Laws of Thermodynamics

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Second Law of  Thermodynamics Constrains the First Law Establishes which processes actually  occur Heat engines are an important  application
Work in Thermodynamic  Processes – Assumptions Dealing with a gas Assumed to be in thermodynamic  equilibrium Every part of the gas is at the same  temperature Every part of the gas is at the same  pressure Ideal gas law applies

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More about Work on a Gas  Cylinder When the gas is compressed Δ V is negative  The work done on the gas is positive When the gas is allowed to expand Δ V is positive The work done on the gas is negative When the volume remains constant No work is done on the gas
Notes about the Work  Equation The pressure remains constant during  the expansion or compression This is called an  isobaric  process The previous work equation can be  used only for an isobaric process

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First Law of Thermodynamics Energy conservation law Relates changes in internal energy to  energy transfers due to heat and work Applicable to all types of processes Provides a connection between  microscopic and macroscopic worlds
First Law, cont. Energy transfers occur due to By doing work Requires a macroscopic displacement of an  object through the application of a force By heat Occurs through the random molecular collisions Both result in a change in the internal  energy,  U, of the system

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chapter12 - Chapter12 SecondLawof Thermodynamics occur...

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