Water vapor,
water vapour or
aqueous vapor, is the
gaseous phase of
water. It is one
state of water within the
hydrosphere. Water
vapor can be produced from the
evaporation or
boiling of liquid water or from the
sublimation of
ice. Unlike other forms of water, water vapor is invisible. Under typical atmospheric conditions, water vapor is continuously generated by evaporation and removed by
condensation. It is lighter than
air and triggers
convection currents that can lead to clouds.