Second law of thermodynamics
The first law
of thermodynamics is a general statement of equivalence between work and heat.
The second law of thermodynamics enables us to know whether a process which is
allowed by first law of thermodynamics can actually occur or not. The second
law of thermodynamics tells about the extent and direction of energy
transformation.
Different
scientists have stated this law in different ways to bring out its salient
features.
(i) Kelvin?s statement
Kelvin?s
statement of second law is based on his experience about the performance of
heat engine.
It is impossible to obtain a continuous supply of
work from a body by cooling it to a temperature below the coldest of its
surroundings.
(ii) Clausius statement
It is impossible for a self acting machine unaided by any
externalagency to transfer heat from a body at a lower temperature to another
body at a higher temperature.
(iii) Kelvin - Planck?s statement
It is impossible to construct a heat engine operating
in a cycle, that will extract heat from a reservoir and perform an equivalent
amount of work.
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