- Clouds are formed by water vapor rising into colder regions of the atmosphere and condensing
- Water vapor is a kind of gas
- Therefore, the condensation of water vapor causes cloud to form

Therefore, the condensation of water vapor causes cloud to form
[Question]Which gas, when condensed into its liquid state in the atmosphere, forms clouds?
[Context]- Clouds are formed by water vapor rising into colder regions of the atmosphere and condensing 
- Water vapor is a kind of gas