Wednesday, May 18, 2011

First law of thermodynamics


The First Law of Thermodynamics is simply the Law of Conservation of Energy, which states that:
 “Energy can neither be created nor destroyed, although it may be converted from one form to another.”
This law is purely a result of experience. A number of other statements have also been given to the law; the important ones are as follows;
·         The total energy of an isolated system remains constant although it may undergo transformation from one form to another.
·         Whenever certain quantity of some energy disappears, an exactly equivalent amount of some other form of energy must be produced.  
·         It is impossible to construct a perpetual motion machine i.e. machine which would produce work continuously without consuming energy (Helmholtz, 1847).

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