Saturday, 21 May 2011

SCIENCE: How does rain fall?

SCIENCE

How does rain fall?

There is always water vapour in the air. During the summer there is
more because the temperature is higher.  When there is so much vapour
in the air it only takes a small drop in the temperature to make the
vapour condense and form small droplets of water, so we say the air is
saturated.

So what happens when all these water droplets in a cloud meet a mass
of cooler air? If the air is very moist the droplets cannot evaporate.
Instead they get bigger and bigger as more and more condensation takes
place. Soon, each small droplet has become a drop and it starts to
fall downward, so we have rain.

Regan Burrell (10)


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