Video Description -- Rain Cloud in a Jar
Make a model of a rain cloud using shaving cream and water.
Materials:
• Shaving Cream
• Clear container -- a jar was used in the video
• Water
• Plastic cup (or container to hold extra water)
• Food Coloring
• Pipette
• [Optional] Paper Towels
Prep:
• Fill the clean container with water. Leave at least half an inch of space from the top.
• Fill the plastic cup with extra water. Add a drop or two of food coloring.
• [Optional] Keep your area clean by laying paper towels underneath your jars.
Procedure:
1. Cover the clear container (filled with water) with a thick layer of shaving cream. The shaving cream should be floating on top.
2. Use the pipette to transfer the colored water over the shaving cream container. Squirt softly over the shaving cream. This process can take a few minutes so be patient.
3. You should see the shaving cream become heavy enough to fall through the water like rain.
Try different things out. Use multiple food colors to get a rainbow effect. What else can you do?
Science:
• The shaving cream is made up of a few chemicals that when sprayed out of the can, will evaporate, leaving millions of bubbles inside. This causes the shaving cream to be lighter than water; thus, it floats on top of the container. When you squirt water from the pipette on top of the shaving cream, you're essentially filling up the shaving cream bubbles with water. Once enough water is inside, the shaving cream cannot support it. The colored water will sink through the shaving cream, pulling some of it down with it. The food coloring is used so that you can see this water as it falls downwards.
• In real rain, the water droplets in the atmosphere will sometimes form around particles of dust and debris on nucleation sites (these are little holes/crevices that help water and other things attach to). When enough water gets together, they form clouds. When fronts come in, the change of temperature can lower how much water our atmosphere can hold. The increased amount of water will be too heavy to stay aloft and will start to pour.
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