1. Change of State

2. Condensation Gas to Liquid
Condensation is the change in state from a gas to a liquid.
The temperature at which condensation occurs is the condensation point.
Condensation and vaporization are the opposite of each other. Consequently they occur at the same temperature.
If energy is being added, vaporization occurs. If energy is removed, condensation occurs.
Condensation is exothermic (energy is removed).
Condensation is the change in state from a gas to a liquid. The temperature at which condensation occurs is the

3. Sublimation: Solid to Gas
Sublimation is the change in state that occurs when a solid changes directly into a gas. Example: dry ice
Sublimation is an endothermic change.
Energy must be added for the solid’s particles to overcome their attraction for each other.
There are two change in states that occur more rarely, but do occur. The first is sublimation, sublimation is the change in state that occurs when a solid changes directly in a gas. An example of sublimation is dry ice. Sublimation is an endothermic change, because energy is being added to cause the change. Energy must be added for the solid’s particle to overcome their attraction for each other.

4. Deposition: Gas to Solid
Deposition is the opposite of sublimation.
With deposition, a gas changes directly to a solid without going through the liquid phase.
Energy is released when deposition occurs so it is an exothermic process.
The second more rare type of state change is deposition. Deposition is the opposite of sublimation, with deposition a gas changes directly to a solid without

5. Change of Temperature vs Change of State
When substances lose or gain energy, one of two things will happen:
Temperature changes
OR (NOT BOTH)
State changes
The temperature of a substance does not change until the change in state is complete.
Example: The temperature of boiling water stays at 100○C until it has all evaporated.