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    Question ID:   10389         Current Version: 1
Question: How does rain form?
Category: Science > Weather
Keywords: occur, form, rain
Type: how
Rating:(0 ratings)    Views: 710    Discussions: 0   In Watch Lists: 1  

 
    Answer:
In order to have rain you must have a cloud--a cloud is made up of water in the air (water vapor.) Along with this water are tiny particles called condensation nuclei--for instance, the little pieces of salt leftover after sea water evaporates, or a particle of dust or smoke. Condensation occurs when the water vapor wraps itself around the tiny particles. Each particle (surrounded by water) becomes a tiny droplet between 0.0001 and 0.005 centimeter in diameter. (The particles range in size, therefore, the droplets range in size.) However, these droplets are too light to fall out of the sky. How will they get big enough to fall?

Picture a huge room full of tiny droplets milling around. If one droplet bumps into another droplet, the bigger droplet will "eat" the smaller droplet. This new bigger droplet will bump into other smaller droplets and become even bigger--this is called coalescence. Soon the droplet is so heavy that the cloud (or the room) can no longer hold it up and it starts falling as rain.

Source: USGS
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