Have you heard of the Ivory Soap experiment? I’ve seen it circulating around the Internet and wanted to test out it with the boys. Here’s how it works: If you unwrap a bar of Ivory™ soap and microwave it, the soap will expand into a foam that is more than six times the size of the original bar!
It’s a fun trick that won’t hurt either your microwave or the soap. The soap trick can be used to demonstrate closed-cell foam formation, physical change, and Charles’ Law.
The boys and I tried it tonight and after reading how easy it was, I thought it would be totally… (ahem) fool-proof. I don’t know what it is with me and experiments but believe it or not, it didn’t turn into giant foam as expected. I followed the instructions EXACTLY (which are simple to begin with) so I am claiming “defective soap” this time around. Lol. We only had one bar (and supposedly it has to be Ivory) so we’ll definitley try again after we buy more. Here is what we did:
Unwrap Ivory and place in microwave safe dish (or on paper towel)
Place in microwave for between 90 seconds to 2 minutes.
Watch and be amazed! Btw, I know the boys are too close to the microwave! Lol. 
Voila! This is what it’s *supposed* to look like:
Our bar did expand but not nearly as much as pictured here. The cool thing is, once it’s in “souffle” form you can mold it and play with it like clay. Fun. Click here for the Ivory Soap trick. Hopefully yours will be perfect. Good luck!
When I worked in preschool & daycare we (the class) would whip Ivory flakes with water and the kids would mold the foam into different shapes. After they dried the kids would take them home for bath time. On the downside, I'm allergic to Ivory soap so I had to wear rubber gloves.