T H E F I R S T L AW O F
The first law of thermodynamics is simply a statement of the conservation of
energy principle, and it asserts that total energy is a thermodynamic property.
Chapter 4: Analysis of closed system
4.1 Boundary work
moving boundary work- expansion and compression work
volume change dV
- positive during an expansion process (volume increasing)
-negative during a compression process (volume decreasing).
Chapter 3 : Properties of Pure substances
3.1 Pure substances
pure substance - A substance that has a fixed chemical composition throughout.
-A mixture of various chemical elements or compounds also qualifies as a pure substance as
long as the mixture is