This is the most fundamental law of thermodynamics and unfortunately invented after first law of thermodynamics.To say it is more basic than first law number zero is allotted to it . The number is about history of physics and community is ready to accept the truth and change accordingly.
Zeroth Law of Thermodynamics states that ‘two systems in thermal equilibrium with a third system separately are in thermal equilibrium with each other’.
The Zeroth Law clearly suggests that when two systems A and B, are in thermal equilibrium, there must be a physical quantity that has the same value for both. This thermodynamic variable whose value is equal for two systems in thermal equilibrium is called temperature (T ).
Thus, if A and B are separately in equilibrium with C, TA = TC and TB = TC. This implies that TA = TB i.e. the systems A and B are also in thermal equilibrium.
Other useful topics in physics
Thermodynamics Introduction
Heat transfer by radiation
Heat transfer by convection
Heat transfer and conduction
Heat and Temperature
Change of State
Zeroth Law of Thermodynamics states that ‘two systems in thermal equilibrium with a third system separately are in thermal equilibrium with each other’.
The Zeroth Law clearly suggests that when two systems A and B, are in thermal equilibrium, there must be a physical quantity that has the same value for both. This thermodynamic variable whose value is equal for two systems in thermal equilibrium is called temperature (T ).
Thus, if A and B are separately in equilibrium with C, TA = TC and TB = TC. This implies that TA = TB i.e. the systems A and B are also in thermal equilibrium.
Other useful topics in physics
Cyclic Process,Reversible Process and Work Done Graphs
Degree of freedom and Law of the Equipartisien energy
Heat transfer by radiation
Heat transfer by convection
Heat transfer and conduction
Heat and Temperature
Change of State
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