State First law of Thermodynamics

 First law of Thermodynamics states that heat and Work are mutually convertible but since energy can neither be energy conversion remains constant


Limitations of first law of the thermodynamic.

1 The first law fixes the exchange rate between heat and work and puts no restriction on the direction of change.

2 Process can only take place in a particular direction but these processes cannot be reversed thought the reversal of a process does not violate first law of Thermodynamics.

3 The first law of Thermodynamics provided a necessary but not a sufficient condition for a process to take place

4 There exists some directional law which would tell whether a particular process occurs or not . Thise forms the basis of second law of Thermodynamics


What do you mean by work ?  

Work is said to be done by a system if the sole effect on things external to the system can be reduced to the raising of a weight.

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