I know that a parcel of air can rise, cool and create clouds and rain but I'm struggling to understand how:
- absolute humidity
- relative humidity
- actual vapour pressure
- saturation vapour pressure
change as a parcel of air with an unchanging amount of water vapour rises, expands and cools.
I think that absolute humidity and relative humidity increase, but is there a difference how absolute and relative humidity behave and how actual vapour pressure and saturation vapour pressure behave?