Thermodynamic Equilibrium-Chemical, Mechanical and Thermal Equilibrium, PDF

Are you looking for the Thermodynamic Equilibrium? So today we will study Chemical, Mechanical and Thermal Equilibrium, PDF. Here you will get the articles of Mechanical Engineering in brief with some key points and you will get to know an enormous amount of knowledge from It. So If you find this articles helpful, please let us know in the comment box, either if any correction required too, also let us know in the comment box.

Thermodynamic Equilibrium:

(When we heard words Thermodynamic Equilibrium that means Balance of Energy, work, and heat.)

The system is said to be thermodynamic equilibrium when no spontaneous change in any macroscopic property is observed as the system is isolated from its surrounding.

The term “Thermodynamic” means it is a branch of physics which deals with the heat, work, and form of energy.

The term “Equilibrium” means the state of balance of system within itself and between system and surrounding.

There is a total 3 thermodynamic equilibrium which are:

  • Chemical Equilibrium
  • Mechanical Equilibrium and
  • Thermal Equilibrium:

Thermodynamic Equilibrium:

Chemical Equilibrium:

A system is said to be chemical equilibrium when no chemical reaction takes place in the system or between system and surrounding.

The chemical composition will be the same throughout the system and this will not vary that system in chemical equilibrium.

This is a reversible reaction.


CaCO→ CaO + CO

When we heat Calcium Carbonate (CaCO3 ) at temperature 1073K will get CaO and CO

Mechanical Equilibrium:

A system is said to be mechanical equilibrium when there is no unbalanced force within the system or between system and surrounding.

It deals with the force.

The pressure in the system is the same at all points and does not change with respect to time.


Treadmill: This is gym instrument on which we run but we don move forward because the force you trying to push forward the same force acting opposite to push backward. So this is one of the best examples of mechanical equilibrium.

Thermal Equilibrium:

A system is said to be thermal equilibrium when there is no temperature difference present and the temperature remains equal at all point.


A hot cup of tea has a higher temperature as compared to surrounding so this is not in thermal equilibrium.

But when you keep this for a duration, till the temperature emits by radiation process to the environment and the surrounding temperature and a cup of tea temperature remains same that moment we can say this is in thermal equilibrium.

“Thermodynamics System-Closed, Open, Isolated system with an example, PDF”

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