No planet in our solar system has an atmosphere made largely of water vapor. There may be such planets orbiting other stars, but none have been conclusively found.
Only the Troposphere has high levels (only 20% however) to suport life, but water vaper is found in all levels of the Atmosphere. But, when Evaperation mixes the water vaper found close to earth with the water in the Troposphere, it condesnes into a cloud before the vaper could have reached the outer layers.
Air and cloud vaper
Evaperation. Thats the prosses that happens when you change a liquid to an Vaper. Glad to help :)
Water vapour or steam.
water vapor is a gas
Condensation
Every planet in the solar system except Mercury has an atmosphere, and all but Mars and Mercury have clouds, but only Earth has liquid water.
ice droplets
Water Vaper forms when liquid water evaporates.
Atmospheric pressure is an important factor in keeping liquid water on the surface of a planet. With no atmosphere, liquid water would quickly escape into space. It would depend on various factors such as the temperature and escape velocity of the planet of course. Scientists think liquid water existed on Mars in the past when the atmosphere was a lot denser. Water does exist on the surface Mars, but only as ice.
Water, atmosphere.
Water, and an atmosphere