12 physics 4. Thermodynamics Page 1.

 12 physics  4. Thermodynamics    Page 1.


Above is the Schematic representation of Zeroth law of thermodynamics.

Case i)

Energy Flows into the system. The system gains energy, and Q is
positive.



Change in internal energy of a system
can be brought about by heating the system.

They does some work on the gas in moving it through some distance, gas gains energy & its temperature increases . On the other hand , gas pushes the piston out, some work is done by gas ,it looses energy & its temperature decreases.





 The first law of thermodynamics is thus a generalization of the law of conservation of energy.


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