Kelvin-Planck statement: No process is possible whose sole result is the absorption of heat from a reservoir and the complete conversion of the heat into work.
Clausius statement : No process is possible whose sole result is the transfer of heat from a colder object to a hotter object.
A process is reversible if it can be reversed such that both the system and the surroundings return to their original states, with no other change anywhere else in the universe.
Spontaneous processes of nature are irreversible. The idealised reversible process is a quasi-static process with no dissipative factors such as friction, viscosity, etc.
Carnot engine is a reversible engine operating between two temperatures T1 (source) and T2 (sink). The Carnot cycle consists of two isothermal processes connected by two adiabatic processes.
No engine operating between two temperatures can have efficiency greater than that of the Carnot engine.
If Q > 0, heat is added to the system
If Q < 0, heat is removed to the system
If W > 0, Work is done by the system
If W < 0, Work is done on the system
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Clausius statement : No process is possible whose sole result is the transfer of heat from a colder object to a hotter object.
A process is reversible if it can be reversed such that both the system and the surroundings return to their original states, with no other change anywhere else in the universe.
Spontaneous processes of nature are irreversible. The idealised reversible process is a quasi-static process with no dissipative factors such as friction, viscosity, etc.
Carnot engine is a reversible engine operating between two temperatures T1 (source) and T2 (sink). The Carnot cycle consists of two isothermal processes connected by two adiabatic processes.
No engine operating between two temperatures can have efficiency greater than that of the Carnot engine.
If Q > 0, heat is added to the system
If Q < 0, heat is removed to the system
If W > 0, Work is done by the system
If W < 0, Work is done on the system
Related Posts
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Internal Energy
Zeroth law of thermodynamics
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Heat transfer by radiation
Heat transfer by convection
Heat transfer and conduction
Heat and Temperature
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