Thermodynamics corollaries Flashcards
What is a crollary
A natural consequence of something else
Corollary 1 first law
There exists a property of a closed system such that a change in its value is equal to the difference between the heat supplied and work done during a change of state.
Corollary 2 first law
Internal energy of an isolated system remains unchanged. An isolated system doesn’t exchange energy/work or matter with the surroundings.
Corollary 3 first law
A perpetual motion machine of the first kind is impossible
Kevin Planck statement
It’s impossible for any device operating on a cycle to receive heat from a single reservoir and produce an amount of work
Clausius
It’s impossible to construct a device that operates in a cycle and transfers heat from a cooler to a hotter body without work being done on the system
Corollary 2 second law
It’s impossible to construct a heat engine operating between 2 reservoirs which will have a higher efficiency than a reversible heat engine operating between the same 2 reservoirs.
Corollary 3 second law
All reversible engines operating between the same 2 reservoirs have the same efficiency
Corollary 4 second law
A scale of temperature can be defined which is independent of any particular thermometric substance, and which provides an absolute zero of temperature
Corollary 5 second law
The efficiency of any reversible engine operating between more than 2 reservoirs must be less than that of a reversible engine operating between 2 reservoirs which have temperatures equal to the highest and lowest temps of the fluid in the original engine
Corollary 6 second law
Clausius inequality: Whenever an engine undergoes a cycle: dQ/T < OR = to zero.
Corollary 7 second law
There exists a property of state of a closed system such that a change in its value is equal to dQ/T = entropy change.
Corollary 8 second law
The entropy of any closed system which is thermally isolated from the surrounding either increases or, if the process undergone by the system is reversible, remains constant.
