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"Let us strive to make each moment beautiful."
Saint Francis DeSales
painting by Katie Bergenholtz

Summer Days #54 : Ivory Soap "Cloud"

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Place an 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.

12 comments:

  1. Coolness - Never heard of this one - sounds really, really fun!!

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  2. I have this experiment on our "to do" list for school this year- it looks like SUCH great fun!

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  3. Oh that looks like so much fun! That actually gives me an idea for a Sunday school lesson.

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  4. This is cool. I know in Girl Scouts we use to use Ivory soap to make bubble bath for our mom's at Christmas time. We also used it for carving.

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  5. definitely doing this!

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  6. I am so going to do this too - I read about it before, but it looks so fun in your photos.

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  7. Very fun!! We also use ivory soap to make marble "sculptures" just like the Ancient Greeks did!

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  8. I have never seen this done before. I'm so excited to do this with my son. Only, I will wait until we study weather in a month or so. Oh, I can't wait! Thanks for sharing!!! Penny

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  9. Thank you so much for sharing this with me! I can't believe that!!! It's awesome and we are sooo adding this to our science list!!

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  10. We just did this it was such fun to watch!

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  11. I tagged you in this.

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  12. Wow! ... Never have seen that before.

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