it's called humidity
It is called water vapor :)
it is condensation
Vaporisation, or evaporation.
Rain.
The comparison of the actual amount of water vapor in the air to the amount of water vapor in the air if it were saturated is called relative humidity. It is expressed as a percentage and indicates how close the air is to being saturated with moisture.
Water vapor in the air is water in the form of a gas.
Water vapor enters the air as water at the surface evaporates or as plants transpire water vapor from their leaves.
The changing of gaseous water vapor in the air to liquid water is called condensation. If it does so high up in the atmosphere and falls as droplets to the ground we call that "rain" - but it has to undergo condensation first.
When water turns into a gas and goes into the air, it is called water vapor. This process is known as evaporation.
When water vapor is added to the air, the density of the air decreases. This is because water vapor molecules are less dense than dry air molecules.
The warmer the temperature, the more water vapor in the air. The colder the temperature, the less water vapor in the air.
Water vapor is water is gas form. Humdity is the amount of water the air can hold. So, they're both water in the air.