Question

Define water vapour. Write what you know about water vapour in ten points.

Answer 1

Hint: Water vapour is water in gaseous state instead of liquid form. It is the outcome of either, the process of evaporation or sublimation.

Complete answer:
- Water vapor is very significant to the weather and climate. - Water vapor is one of the Earth's most vital greenhouse gas.
- It accounts for about $90\mathrm{\%}$ of the Earth's natural greenhouse effect, which enables keep the Earth warm enough to support life.
- When water evaporates from the surface of the Earth, it cools the surface.
- The process of cooling of water vapour keeps the surface from getting too hot.
- It is rarely referred to in the global warming debate that the surface cooling effect of evaporation is more powerful than its greenhouse warming effect.
- Water vapor is water in its gaseous state-instead of liquid or solid.It is totally invisible.
- When the air gets saturated with the water vapour, at a specific temperature it will form frost as it starts to condense.
- Water vapour holds its importance as an evidence of the existence of extraterrestrial liquid water on a planet.

Note:
-Water vapour in the atmosphere is always below its boiling point. Steam often has droplets of water, which is what is seen when water is boiling.
- Clouds are formed due to the condensation of water vapour and their transformation into tiny droplets of water which then precipitates in the form of air, snow, sleet or hail.