It does not give information concerning feasibility of a thermodynamic proces. NOT EXPLAINED BY FIRST LAW.

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Presentation transcript:

It does not give information concerning feasibility of a thermodynamic proces. NOT EXPLAINED BY FIRST LAW

It tells that work obtained is equal to heat absorbed but in actual heat absorbed can not be completely converted into work. Limitations motivating second law

4 The second law of thermodynamics It will arouse changes while the heat transfers from low temp.substance to high temp. one.

All spontaneous processes are thermodynamically irreversible..

Without the use of any external agency, heat can not by itself pass from a colder to a hotter body.

State 1 T hot State 2 T hot State 4 T cold State 3 T cold isothermal adiabatic isothermal q=0, w=C V  T q=0, w=-C V  T w= -nRT hot ln(V2/V1) q=-w w= -nRT cold ln(V4/V3) q=-w

112 The second law of thermodynamics It will arouse changes while the heat transfers from low temp.substance to high temp. one.

119 The second law of thermodynamics It will arouse changes while the heat transfers from low temp.substance to high temp. one.