The Second Law of Thermodynamics Steven Bearden Ariel Lewis
Rebecca White
Slide 3
Statements of the Second Law
Slide 4
No process is possible which consists solely in the transfer of
heat from one temperature level to a higher one. Work is required
HotCold Heat X
Slide 5
No apparatus can operate in such a way that its only effect in
the system and surroundings is to completely convert heat absorbed
by a system into work done by the system. You cant have 100%
conversion of heat into work within a closed system.
Slide 6
Entropy Entropy is the driving force to equilibrium. Intrinsic
property that represents the unavailability of a systems thermal
energy for conversion into mechanical work.
Slide 7
Carnot Engine Completely reversible No friction Infinitesimal
Temperature difference No unrestrained expansion No change in
surroundings
Slide 8
Heat Engine Realistic example Heat reservoirs Rejected heat
Irreversibility
Slide 9
Overview Flaws in first law Importance of second law