Second Law of Thermodynamics | Physics Grade 11 Notes

Thermodynamics

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Second Law of Thermodynamics | Physics Grade 11 Notes

Second Law of Thermodynamics

Second Law of Thermodynamics
The second law of thermodynamics can be stated in different ways:

Kelvin’s Statement
According to Kelvin, the second law of thermodynamics can be stated as 'It is impossible to get a continuous supply of work from a body by cooling it to a temperature than that of its surroundings'.
This statement is applicable to heat engines. In a heat engine, the working substance gets some heat from the source, converts a part of it into mechanical work, and rejects remaining part to the sink.
 
Clausius Statement
According to Clausius, "It is impossible for a self-acting machine unaided by any external energy to convey heat from one body to another at a higher temperature i.e. we cannot make heat flow from a colder body to a warmer body without doing external work".

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