Zeroth
law
If objects A and B are separately in thermal
equilibrium with a third object C then objects A and B are in thermal
equilibrium with each other
First
law (Law of conservation of energy)
Energy can be neither be
created nor be destroyed. It can only change forms. In any process in an
isolated system the total energy remain same.
Q = ▲U + W
▲U = Change in internal
energy
W = Work done by the
system
Second
Law
It states that the total entropy of an isolated
system always increases over time or remains constant in idea case where the
system is in steady of state or undergoing a reversible process. The increase
in entropy for the irreversibility of the natural process and asymmetry between
future and past
OR
When two isolated system
is separated by near by region of space each in thermodynamic Equilibrium
itself but not in equilibrium with each other at first are at same time allowed
to interact breaking isolation that separated the two system and they exchanges
matter of energy they will reaches mutual thermodynamic equilibrium.
Third
law
As temperature approaches
absolute zero the entropy of the system approaches minimum.
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