Question

What do you mean by change of state of matter?

Define vapourisation by giving an example

Answer 1

change of matter means Changing of places of molecule for example if the molecules of water H2O come closer to each other then it becomes Ice and hence it converts into solid state from liquid state which water into ice

Answer 2

They occur when matterabsorbs or loses energy. Processes in which matter changes between liquid and solid states are freezing and melting. Processes in which matter changes between liquid and gaseousstates are vaporization, evaporation n condense.....
Vaporization is a phase transition from the liquid phase to vapor. There are two types of vaporization: evaporation and boiling. 
Eg- water boiling