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B.4 Thermodynamics

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2024/07/05 08:27
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B.4.1 Basic Definitions

Internal Energy
Types of Systems
Closed system
Isolated system
Sign Convention
Clausius’ sign convention

B.4.1 First Law of Thermodynamics

First Law of Thermodynamics
Work Done by a Closed System
Change in Internal Energy

B.4.2 Entropy

Definition of Entropy
Entropy and Heat

B.4.3 Second Law of Thermodynamics

Second Law of thermodynamics
As a change of entropy
ΔSnet=ΔSsystem+ΔSsurroundings0\Delta S_{\text{net}} = \Delta S_{\text{system}} + \Delta S_{\text{surroundings}} \geq 0
Clausius statement:
It is impossible to construct a device that operates in a cycle and produces no effect other than the transfer of heat from a lower-temperature body to a higher-temperature body.
B.4.3-1
Kelvin statement:
It is impossible for any device that operates on a cycle to receive heat from a single reservoir and produce only a net amount of work.
B.4.3-2
Irreversible Processes
B.4.3-3
Reversible Processes

B.4.4 Thermodynamic Processes

Isovolumetric Process
B.4.4-1
Isobaric Process
B.4.4-2
Isothermal Process
B.4.4-3
Adiabatic Process
B.4.4-4

B.4.5 Heat Engines

Heat Engine Definition
Heat Engine Efficiency
Carnot Cycle
B.4.5-1 Temperature-entropy diagram for the Carnot cycle