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A branch of physics dealing with the transformation of heat into other forms of energy. The three basic laws are as follows :
1.Energy can be neither created nor destroyed, heat and mechanical work being mutually convertible.
2.It's impossible for an unaided self-acting machine to convey heat from one body to another at a higher temperature
3.It's impossible by any procedure, no matter hoe idealized, to reduce any system to the 'absolute zero' of temperature(0K/-273ºC) in a finite number of operations.