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Discovery Labs: RAIN CLOUD IN A JAR
- Krystyna
- 1 day ago
- 2 min read
OBJECTIVE:
To demonstrate how clouds hold water and release rain when they become too heavy. This experiment will help students understand the basic process of precipitation using water, shaving cream, and food coloring.
What do you think will happen if you add colored water to a shaving cream cloud?
WHAT YOU NEED:
Clear glass jar or cup
Water
Shaving cream
Blue food coloring
Small bowl or cup
Spoon, dropper, or pipette
Paper towels
INSTRUCTIONS:
Fill the jar about ¾ full with water.
Add a fluffy layer of shaving cream on top of the water. This will act as your cloud.
In a small bowl, mix a few drops of blue food coloring with a little bit of water.
Use a spoon, dropper, or pipette to slowly add the blue water onto the shaving cream cloud.
Watch carefully as the blue water begins to move through the shaving cream.
Continue adding drops until the “cloud” becomes heavy and the blue “rain” begins to fall into the jar.
Observe how the colored water moves through the clear water below.
OBSERVATION:
Watch how the shaving cream holds the colored water for a little while before it begins to fall through. As more blue water is added, the “cloud” becomes too full and releases the liquid into the water below, just like rain falling from a real cloud.
EXPLANATION: Why Does a Rain Cloud in a Jar Work?
Clouds are made up of tiny water droplets. When clouds collect more and more water, the droplets begin to join together and become heavier. Eventually, the cloud cannot hold all of the water anymore, and the water falls to the ground as rain.
In this experiment, the shaving cream represents the cloud. The blue water represents rain. At first, the shaving cream can hold some of the colored water. But once too much is added, the liquid pushes through and falls into the jar.
This helps show how precipitation happens in nature.
CONCLUSION:
This experiment demonstrates how clouds can become heavy with water and release rain. It is a simple and fun way to explore weather, clouds, and the water cycle.
EXTENSION:
Try using different colors of food coloring to create a rainbow rain cloud.
Test what happens when you add the colored water slowly versus quickly.
Compare a thin shaving cream cloud with a thick shaving cream cloud. Which one holds the “rain” longer?
Talk about different types of precipitation, such as rain, snow, sleet, and hail.
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