Projects: UDL : temp- clouds state change and water cycle
This page last changed on Aug 31, 2007 by mateoaw.
There is always water vapor in the air, but the individual water molecules are so tiny that you can't see them. Water in the air is invisible unless it forms tiny water droplets (fog) or bigger ones (rain) or freezes (snow crystals). Here's one way to picture it.
Look at the three boxes below. What do you see in each box?
Now look at the three boxes up close. What do you see in each box?
Each box has 20 dots in it. When they are in large groups (Box A) it is like rain droplets, and you can see them. When they are in small groups (Box B) it is like clouds or fog. When they are spread out (Box C), it is like water vapor. The individual molecules are invisible to our eyes because they are so small.
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