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Zeroth law of Thermodynamics

The zeroth law of thermodynamics states that if two thermodynamic systems are each in thermal equilibrium with a third, then they are in thermal equilibrium with each other.

It deals with thermal equilibrium and basis for temperature measurement. It also gives the concept of isotherm.

Zeroth Law

The above diagram says that A is in thermal equilibrium with B & B is in thermal equilibrium with C then A and C are also in thermal equilibrium.

Thermodynamics

Thermodynamics is a branch of physics concerned with heat and temperature and their relation to energy and work.In particular, it describes how thermal energy is converted to work and how it affects matter.It deals with equilibrium and feasiblity of a process Thermodynamics applies to a wide variety of topics in science and engineering, especially physical chemistry, chemical engineering and mechanical engineering.