Question

what are the limitations of first law of thermodynamics?

Answer 1

Limitations of First Law of Thermodynamics. First law does not provide a clear idea about the direction of absorption or evolution of heat. The informations provided by the first law of thermodynamics are not enough to predict the spontaneity or feasibility of a process.

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Answer 2

Answer:

Limitations of first law of thermodynamics:-)

1}}lt does not indicate the direction of transfer of heat.

Heat always flows from a hot body to a called 1. First law does not give any reason as to why he cannot flow from a cold body to hot one.

2}} lt does not tell anything about the conditions under which heat can be converted into mechanical work. first law explains the stopping of a revolving wheel due to conversion of its kinetic energy into heat due to friction. But it fails to explain as to why the heat energy cannot be converted into kinetic energy of rotation of wheel and put it back into rotation.

3}} lt does not indicate the extent to which heat energy can be converted into mechanical work continuously.

No heat engine can convert all the heat extracted from the source into mechanical work continuously without rejecting a part of it to the surrounding. First law has no explanation of this fact.