What is the Difference Between Phase Diagram and Equilibrium Diagram?

Phase diagrams and equilibrium diagrams are both charts or graphs that show the relationship between pressure and the composition of any system, detailing the conditions of thermodynamically distinct phases that coexist in the system. Both diagrams can be used interchangeably, as they share the same purpose and provide similar information. However, some sources differentiate between the two as follows:

• Phase Diagram: A phase diagram represents the equilibrium between different phases that coexist in a system, such as solid, liquid, and gas phases. It shows lines of equilibrium or phase boundaries, which mark conditions under which multiple phases can coexist at equilibrium.
• Equilibrium Diagram: An equilibrium diagram is a chart that shows the equilibrium between phases of a substance that coexist in a closed system. It is also known as a phase diagram.

In summary, the main difference between phase diagrams and equilibrium diagrams is that phase diagrams primarily focus on the coexistence of different phases in a system, while equilibrium diagrams emphasize the equilibrium conditions between these phases. However, both terms are often used interchangeably in practice, as they essentially represent the same concept.

Comparative Table: Phase Diagram vs Equilibrium Diagram

There is no significant difference between a phase diagram and an equilibrium diagram, as they are often used interchangeably to describe the same concept. Both diagrams represent the relationship between pressure, temperature, and the composition of a system, showing the phase boundaries or equilibrium boundaries that separate phases from each other.

Here is a table summarizing the key points of both diagrams:

In summary, phase diagrams and equilibrium diagrams are essentially the same, providing a graphical representation of the physical states of a substance under different conditions of temperature and pressure.