Making a cloud inside a bottle may help you figure out how they form outside in the sky.
Warm, moist air rises in the atmosphere, cools, and beautiful, puffy clouds can be the result. Tiny water droplets become clouds of many different kinds at many different altitudes depending on the conditions. Making your own cloud in a bottle is a popular activity in many science books but it can be a little tricky to pull off. Sometimes the results can be hard to see but practice makes perfect. It also helps to use some ingredients other than water, too.