Cloud in a Bottle Clouds are formed when water vapor is cooled to form tiny water droplets.  email to friend
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Have you ever wondered how clouds form? Clouds are formed when water vapor is cooled enough to form tiny water droplets. This is exactly what happens when moist air rises in the atmosphere, cools, and water droplets form into clouds. Making your own cloud is a popular experiment in many science books, but you should know that the results are not very striking. Yes, you'll see a very faint cloud (very faint), but it's a little tricky.