Correlate entopy and disorder with the help of fusion and vaporisaton processes.

Consider the conversion

Ice-----> Water (fusion) 

Ice being solid is in highly ordered state i.e. state of low entropy (disorder), upon conversion into water it becomes liquid and molecules are free to move about i.e. order has decreased and entropy has increased.

Similarly,

Water -----> Ice (Vaporisation)

Disorder i.e. entropy, further increases and the molecules are in gaseous state i.e in constant random motion.

Thus it can be observed that entropy is increasing.