Thursday, October 23, 2014

Water Vapor


We've learned that clouds are tiny little bits of water floating in the air.
The water that turns into clouds usually starts off as water vapor.
That's kind of like the steam that comes up in the air from a pot of boiling hot water on the stove.

You really can't see water vapor that's in the air around us, but we have tools that can tell us how much is in the air.
When we're measuring water vapor, we call that humidity.

Even though the air around us is all invisible, we know that there is such a thing as dry air and wet air.
Usually we say it is very humid if the air is wet.

In the desert, there is not much water vapor around, so that air is very dry.
In the rainforest or in places with lots of water and very hot temperature, there is a lot of water vapor around, so it is very humid.

The water vapor can eventually rise and turn into clouds, so if the air is very humid there will be more clouds.
If it is very dry, there will be no clouds.

(from: wikipedia - water vapor)


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