Cloud Formation
The air always contains water vapor. When this water vapor overflow into water droplets, the clouds formed. Peluapan this can happen in two ways:
1. If the hot air, more steam is contained in the air because the water faster menyejat. Hot air is loaded with this water will rise higher, until arriving in one layer with a lower temperature, it will melt and vapor cloud formed, the molecules of water points are countless.
2. The air temperature does not change, but circumstances damp atmosphere. The longer the air will become increasingly tepu with water vapor.
If the cloud has formed, water droplets in clouds will become even greater and the cloud will become increasingly severe, and slowly the force of gravity pulling it down. Up until the point where the water droplets will continue to fall down and the rain descended.
If these water droplets meet the hot air, the dots will evaporate and the clouds disappeared. This is what causes the clouds always changing shape. Water contained in the clouds evaporate and melt turns. This is also a cause sometimes there are clouds that bring no rain.
ref :
http://id.wikipedia.org/wiki/Awan
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