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# Second Law of Thermodynamics Notes | EduRev

## : Second Law of Thermodynamics Notes | EduRev

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Chapter 6
Second Law of Thermodynamics
Page 2

Chapter 6
Second Law of Thermodynamics
It is now clear that we canâ€™t construct a heat engine with just one
+ve heat interaction.
Leads Up To Second Law Of
Thermodynamics
The above engine is not possible.
Page 3

Chapter 6
Second Law of Thermodynamics
It is now clear that we canâ€™t construct a heat engine with just one
+ve heat interaction.
Leads Up To Second Law Of
Thermodynamics
The above engine is not possible.
Second Law Of Thermodynamics
(contdâ€¦)
Is it possible to construct a heat engine with only one -ve
heat interaction?
Is the following engine possible?
The answer is yes, because
This is what happens in a
stirrer
Page 4

Chapter 6
Second Law of Thermodynamics
It is now clear that we canâ€™t construct a heat engine with just one
+ve heat interaction.
Leads Up To Second Law Of
Thermodynamics
The above engine is not possible.
Second Law Of Thermodynamics
(contdâ€¦)
Is it possible to construct a heat engine with only one -ve
heat interaction?
Is the following engine possible?
The answer is yes, because
This is what happens in a
stirrer
Second Law Of Thermodynamics
(contdâ€¦)
Perpetual motion machine of the second kind is not possible.
Perpetual motion machine of
the first kind violates I LAW
(It produces work without
receiving heat)
W
Page 5

Chapter 6
Second Law of Thermodynamics
It is now clear that we canâ€™t construct a heat engine with just one
+ve heat interaction.
Leads Up To Second Law Of
Thermodynamics
The above engine is not possible.
Second Law Of Thermodynamics
(contdâ€¦)
Is it possible to construct a heat engine with only one -ve
heat interaction?
Is the following engine possible?
The answer is yes, because
This is what happens in a
stirrer
Second Law Of Thermodynamics
(contdâ€¦)
Perpetual motion machine of the second kind is not possible.
Perpetual motion machine of
the first kind violates I LAW
(It produces work without
receiving heat)
W
Statement 1: It is impossible to construct a device which
operating in a cycle operating in a cycle will produce no effect other than raising of
a weight and and exchange of heat with a single single reservoir.
Note the two underlined words.
II Law applies only for a cycle - not for a process!! (We already
know that during an isothermal process the system can exchange
heat with a single reservoir and yet deliver work)
!!There is nothing like a 100% efficient heat engine!!
Enunciation of II Law of Thermodynamics
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