Home School Life Journal From Preschool to High School

Home School Life Journal ........... Ceramics by Katie Bergenholtz
"Let us strive to make each moment beautiful."
Saint Francis DeSales

Concoctions For Play: Ivory Soap Cloud

Ivory Soap Cloud
This experiment has been around so long, that you can find it many places. We placed the Ivory soap bar in the center of a plate and into the microwave. Cook the bar for 2 minutes on high in the microwave.  When your soap cloud is finished, let it cool before letting the kids touch it.

You can also do a comparison with Ivory soap and another brand of soap, putting them in water to see if they sink or float. Ivory soap floats because it has air pumped into it when it is made.
has come up with a wonderful recipe for Fluffy Bathtub Paint recipe that uses the microwaved Ivory soap, but since we were going for the cloud theme, we just left ours in the cloud state for them to play with.
The science behind it?
Charles Law states that when a gas is heated, its volume will increase. All that air that had been pumped into the soap when it was made increased dramatically in volume.
Review physical vs. chemical change, and note that this is a physical change.


  1. I still want to buy Dove and try this experiment one of these days - it looks very dramatic indeed :)

  2. I really want to try this too. I wonder if we can get Ivory soap in the UK. Great idea to do it as part of your cloud project.

  3. Anonymous23.7.13

    This is one I've wanted to do for so long, but we don't own a microwave. I just looks like so much fun!

  4. Cool, I keep forgetting to do this with my kids. They would love this experiment.
    Kelly at Little Wonders' Days


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