The Zeroth Law of Thermodynamics.
This law states that if any object “A” is in thermal equilibrium with another object “B” which in turn is in thermal equilibrium with an object “C”, then object “C” is also in thermal equilibrium with object “A”. This law allows us to build thermometers. For example the length of a mercury column “B” may be used as a measure to compare the temperatures of the other two objects.
The First Law of Thermodymanics.
(Conservation of Energy). The principle of conservation of energy states that energy can neither be created nor destroyed. If a system undergoes a process by heat and work transfer, then the net heat supplied plus the net work input, is equal to the change of intrinsic energy of the working fluid.
The Second Law of Thermodynamics.
The second law of thermodynamics states that no heat engine can be more efficient than a reversible heat engine working between two fixed temperature limits.(Carnot cycle) i.e. the maximum thermal efficiency is equal to the thermal efficiency of the Carnot cycle.
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