Question

which thermodynamic variables is defined by zeroth law?

Answer 1

zeroth law :

The zeroth law of thermodynamics states that there exists a scalar quantity, called temperature, which is a property of all thermodynamic systems, such that equality of temperatures is the only condition for the thermodynamic systems to be in thermal equilibrium.

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Answer 2

Answer:

The Zeroth law of thermodynamics is the basis for measurement of temperature and setting its scale. In layman's terms we can say that when two bodies have temperature equal to third body then the two also have temperature equal to each other.