Answer
Correct Answer is
Heat is added or lost
Step-by-step explanation
we know that there are four well know phases these are as follows
1. solid
2.liquid
3.gas
4. plasma
when a material changes from one phase to another phase this phenomena is known as phase change
for example conversion of water from liquid form to vapor form is a phase change.
In all phase changes like change of solid phase to liquid phase, change of liquid phase to vapor phase or vapor to liquid phase heat is always involved to change the bonding between the molecules of substance. When liquid changes to solid form that time Heat leaves the liquid as it freezes.During these phase changes average kinetic energy does not change nor temperature changes