Materials:
· water
· shaving cream
· food coloring or liquid watercolor
· dropper or pipette for liquid watercolors
 
Start by putting a large dollop of shaving cream on top of a jar of water. Discuss how the water droplets rise in the air and condense on dust particles. A huge group of them together is a cloud. Explain that in this demo the shaving cream is the cloud.
Add drops of liquid watercolor or food coloring. Once it gets saturated enough it will start to rain.
Each had a different thickness so had a little bit of a different effect. The food coloring ran through quicker and the liquid watercolors had more of a rain effect.
Both give kids the cloud visual so use whatever you have on hand, but if you have both it’s fun to experiment to see the difference!