describe unary phase diagram with example

Classification of Phase Diagrams

One component $($unary$)$ phase diagrams

Also known as P$-$T diagrams

The simple case is Water.

How many single$-$phase

regions?

How many two$-$phase

regions?

Is there any three$-,$ or

more$-$phase regions?

$\backslash$table$[[$Gibb$\text{'}$s Phase Rule:,$\backslash$table$[[$F$=$ # variables$],[$C$=$# components$],[P=$# phases$]]]]$ Unary phase diagram of water