SECOND LAW OF THERMODYNAMICS
It is stated in various forms. Some of them are as follows:
Heat cannot flow from a colder body to a hotter body on its own.
Heat cannot be converted into work completely without causing some permanent changes in the system or in the surroundings.
All spontaneous processes are thermodynamiclly irreversible and entropy of the system inereases.
It is impossible to construct a machine working in cycles and transfers heat from a lower temperature region to a higher temperature region without intervension of an external agency (such an imaginery machine is called perpetual motion machine of second kind).
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