Question

Thermodynamical variable is defined by

Answer 1

the internal energy of a system is expressed in terms of pair of conjugate variable such as temperatures and entropy or pressure and volume .In fact, all thermodynamic potentials are expressed in terms of conjugate pairs.

Answer 2

In Thermodynamics the state of a system at any instant is represented by its condition at that instant the condition is completely subxiphoid buy a set of measurable quantities which are called functions of state or thermodynamics variable.