If it is melting, boiling, condensing, subliming, or depositing, then it is changing state.
When a substance changes from one state of matter to another it is called changing its state. Temperature changes are usually the main cause of this change.
When a substance changes from one state of matter to another it is called changing its state. Temperature changes are usually the main cause of this change.
I think it can be classified as either a Chemical Reaction. Or an Endothermic reaction. I may not be understanding the correct queston though.
Motion
The change from one state of matter to another is called a phase transition.
It may change its measurable properties but a simple state change is brought on by an increase or decrease the energy content of the material and does not alter the material from one material to another.
Change of state.
Matter I think I'm not 100% shure but it say in my book matter in one state often can change to another state by adding or removing thermal energy
a liquid
phase change.
tempature
heat