CH7 : Entropy Flashcards
List 3 extensive properties used in thermodynamics
Mass, energy, entropy
State the entropy statement
It is impossible for any system to operate in a way that entropy is destroyed
What does the equality in the Clausius inequality hold for?
For totally or just internally reversible cycles
What does the inequality in the Clausius inequality hold for?
For the irreversible ones
The entropy change between two specified states is the ____ whether the process is reversible or irreversible
same
The entropy generation Sgen is always a _____ quantity or ____
positive, zero
Entropy generation is due entirely to the presence of
irreversibilities
Entropy is a _____ property, entropy is conserved during the ________________ only and ______ during all actual processes
nonconserved, idealized reversible, increases
The entropy ____ can be negative, but the entropy ______ cannot
change, generation
Definition of isentropic process
A process during which the entropy remains constant
Another term we can use for isentropic is
adiabatic
How does the isentropic process appears on a T-s diagram?
Vertical line
What is the Mollier diagram?
h-s diagram
Liquids and solids can be approximated as incompressible substances, why is that so?
Their specific volumes remain nearly constant during a process
What work does not contribute to entropy?
Mechanical work
