It states that the entropy of an isolated system which is not in equilibrium will tend to increase over time and is maximum at equilibrium.
ΔS >/= 0
∫dQ/T >/= 0
Other statements of Second law of thermodynamics:
In the system, occurring processes tends to increase the entropy of universe.
Heat flow from a material at lower temperature to a material at higher temperature cannot be spontaneous.
In a cyclic process, it is impossible to convert heat completely into work.
It can be deduced by Second law of thermodynamics that
“At a particular set of temperatures, for all the reversible engines the efficiency is same and no engine can have more efficiency than this.”
Efficiency, n = 1 – T1/T2
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