2007-03-03 20:11:53 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Weather
Clouds are formed ,mainly as the result of vertical motion of air.When a humid air rises it gets cooled and once it reaches the dewpoint temperature, condensation starts.The condesation takes place in the presence of condensation nuclei.The atmosphere usually has sufficient condensation nuclei for cloud droplets to form.During condensation process, a hygroscopic nucleus which is capable of absorbing the water vapour, grows up,overcomes the curvature effect and remains in suspension as a droplet .Many such droplets together form a cloud.
2007-03-03 22:46:05 · answer #1 · answered by Arasan 7 · 0⤊ 0⤋
When water vapour in the air is cooled (e.g. by hitting a mountain and is forced to rise) and condenses as part of the water cycle.
Clouds consist of billions of tiny water droplets (and even ice crystals) floating in the sky and appear in a variety of shapes and sizes depending on how and where they formed. However, there are four main types of cloud:
- Cirrus
- Cumulonimbus
- Cumulus
- Stratus
Hope I helped!
Lorna
2007-03-03 20:17:24 · answer #2 · answered by ? 6 · 1⤊ 0⤋
a cloud is formed when relatively moist air rises. As a mass of air ascends, the lower pressures prevailing a higher levels allow it to expand. hope this helps!
2007-03-03 23:04:54 · answer #3 · answered by ms_mw_2004 1 · 0⤊ 0⤋
evaporation from sea, lakes etc.
Water vapour is condensed as it reaches a certain altitude as the higher you go the colder it gets.
The white colour you see is the vapour changing it's phase from gas to liquid
2007-03-03 20:34:54 · answer #4 · answered by steviso 2 · 0⤊ 0⤋
evaporation from the sea
2007-03-04 03:06:22 · answer #5 · answered by Justin 6 · 0⤊ 0⤋