## What is Prigogine principle?

In 1945 Prigogine (see also Prigogine (1947)) proposed a “Theorem of Minimum Entropy Production” which applies only to the purely diffusive linear regime, with negligible inertial terms, near a stationary thermodynamically non-equilibrium state.

**What is non equilibrium stationary state?**

Stationary state arises when the concentrations of the intermediate components no longer varies with time. Now will see that the stationary state may be characterized by an extremum principle, — the entropy production has its minimum value compatible with the external constraints.

**What is difference between equilibrium and nonequilibrium?**

A profound difference separates equilibrium from non-equilibrium thermodynamics. Equilibrium thermodynamics ignores the time-courses of physical processes. In contrast, non-equilibrium thermodynamics attempts to describe their time-courses in continuous detail.

### Which best describes entropy?

entropy, the measure of a system’s thermal energy per unit temperature that is unavailable for doing useful work. Because work is obtained from ordered molecular motion, the amount of entropy is also a measure of the molecular disorder, or randomness, of a system.

**Which gas has highest entropy?**

hydrogen gas

Entropy is the measure of degree of disorder (or randomness) of a system. The greater the disorder in a system, the higher is the entropy. Hence, entropy is highest for hydrogen gas.

**Why is living state a non-equilibrium steady state?**

As living organisms work continuously, they cannot afford to reach equilibrium. Hence, the living state is in a non-equilibrium steady-state to be able to perform work. This is achieved by energy input provided lay metobolism.

## What are the fundamental concepts of non-equilibrium thermodynamics?

Non-equilibrium or nonequilibrium Non-equilibrium thermodynamics is a theory where the powerful methods of equilibrium are missing. Non-equilibrium thermodynamics is considered as an emergent theory; its fundamental principles, like the second law, are due to microscopic or mesoscopic properties of matter.