Question

Why does water vapour vary from place to place

Answer 1

Water vapour enters the atmosphere by the evaporation of water from both land and water. The water vapor content of atmosphere vary from place to place because the humidity capacity of air is determined.

Answer 2

Water vapour enters the atmosphere by both sea level and land level. When atmosphere is hot it becomes lighter and a vacant place is created. So water vapour travel from one place to another to fulfill the vacant place.