Chapter 4 Flashcards
The expansion and compression work in a piston-cylinder device
Moving boundary work (P dV work)
A process during which the system remains nearly in equilibrium at all times
Quasi-equilibrium process
Wb is positive for ____
Expansion
Wb is negative for ____
Compression
The work associated with a moving boundary is called _____
Boundary work
The boundary work done during a process depends…
On the path followed as well as the end states
The area under the process curve on a P-V diagram represents the _____
Boundary work
The area under the process curve on a P-V diagram is equal, in magnitude, to…
The work done during a quasi-equilibrium expansion or compression process of a closed system
The net work done during a cycle
The difference between the work done by the system and the work done on the system
What is the boundary work for a constant volume process?
Wb=0
Boundary work done during _____ is always zero
A constant volume process
Energy balance when sign convention is used
Heat input and work output are positive
Heat output and work input are menegative
Stationary system: energy balance
Q-W = change in U
Work done on the system
Negative
Work done by the system
Positive
