It is called water vapor :)
it is condensation
Condensation
Condensation.
Vaporisation, or evaporation.
Call your city hall or local water company and complain there is air in your water pipes.
A cloud.
water vapour or steam
You should not have air in your pipes. Call a plumber.
Rain.
it's called humidity
This is called the "relative humidity."
A sea breeze