ME 200: Thermodynamics I
Lecture 3: Basic Thermodynamic Concepts

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Last Lecture
What is thermodynamics?
» Study of energy transformations
» Relationships among physical quantities of different
substances affected by such transformations
Two approaches
» Classical thermodynamics: macroscopic (considers
large scale behavior)
» Statistical thermodynamics: microscopic (considers
molecular scale behavior)
In ME 200, we will focus on understanding large scale
behavior, statistical viewpoints in a supporting role
Dimensions and units

This Lecture
Discuss some terms and concepts commonly used in
thermodynamic analysis
» System
» Property
» State
» Equilibrium
» Process
» Cycle
» Energy

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System and Surroundings
What is a thermodynamic system?
» Any three-dimensional region of space bounded by
one or more arbitrary geometric surfaces
What is meant by the term surroundings?
» The region of space outside the arbitrary
boundaries
System boundary may be real or it could be
immaginary
The system may be stationary or moving