Ans : Sublimation :
Sublimation is the process in which some solids upon heating instead of changing into liquid state are converted directly into gaseous (vapour) state.
Example :
Ammonium Chloride , Napthaline , Iodine.
Melting Point :
The melting point of a solid is the temperature at which it changes state from solid to liquid at atmospheric pressure. At this point the solid & liquid phase exists in equilibrium. At this point the temperature of solid & liquid remains the same until all the solid is melted through heat.
Fusion :
The change of state of a substance from solid to liquid at melting point is called fusion.
Vapourization :
The change of matter from liquid state into gaseous state is called vapourization.
Boiling Point :
The temperature at which the vapour pressure of the liquid becomes equal to the external pressure applied on the liquid. At this point the bubbles of vapours forms inside the liquid & rise to the surface to burst & converted to gas. At this point the temperature of the liquid remains same until all the liquid is vapourized.
Evaporation :
Escaping of certain molecules from the surface of the liquid due to increase of kinetic energy is called evaporation. Evaporation continues at all temperatures & is a slow process.
Condensation :
Condensation is the change of the physical state of matter from gas phase into liquid phase, & is the reverse of vaporization. It can also be defined as the change in the state of water vapor to liquid water when in contact with any surface.
Deposition :
When the transition happens from the gaseous phase into the solid phase directly, the change is called deposition.