This rule was derived by an American physicist
Josiah Willard Gibbs in 1874, hence the name Gibbs
It correlates the number of phases and the number of
components by what is known as the degree of freedom.
Any matter can exist in three different states, namely
Solid, Liquid and Gase
These states are interchangeable i.e. one phase can be
changed into the other when a certain point is reached.
As example, for solid to liquid phase chan
Dr. R. Usha
Miranda House, Delhi University
The phase rule
What is a phase diagram?
The phase diagram for water
Equilibrium between solid and vapour (sublimation curve)
Some Basic Terminology
A system: is the part of the universe we wish to study.
The surroundings: the rest of the universe.
Types of systems
Phase Change Material
Phase Change Materials: are substances which could
solidify and melt a and releasing large amount of heat
Why is Phase Change Materials termed as Latent
heat storage units?
Phase change materials have high h