Weather School: How Clouds Form

AUGUSTA, GA (WFXG) - Clouds come in all shapes and sizes. Some are tall, some are short, some are big, some are small. But any cloud needs just three things to form.

To show this, we'll create a cloud in a bottle. To do this, fill a 2-liter plastic bottle about a third of the way with warm water.

Water vapor evaporates into the air inside when the cap is put on the bottle and closed. That's just one ingredient needed to make a cloud. Squeezing the bottle and letting it go drops the air pressure inside but nothing else happens. That's because a drop in air pressure and water vapor are not enough to form a cloud. The last ingredient comes from the smoke from a match.

Once the cap is put back on and closed, squeezing the bottle again and letting it go, forms a cloud. That's because dust, smoke, or other particles are needed to form clouds.

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