Science with Soap

Homeschooling is a lot of fun. Here is a fun experiment that we found the other day, that I thought that I would share.

You have to use Ivory soap for this experiment to work. Ivory soap has a large amount of air in it (it gets whipped with big beaters apparently). Air, contains water moisture & microwaves “excite” those water molecules. This experiment shows you the microwaves radiation at work.

In terms of materials, it’s fairly easy. You need a microwave, bar of Ivory soap & plate.


We only zapped our Ivory soap bar for a minute at a time. We found that after one minute it had expanded so much that we had to stop it. Note that when you open the microwave it collapses a little.

There was still a fair amount of the bar left that had not expanded so we put it in for a further minute.

If you really don’t care about your microwave, I guess that you could do it all in one go, but we weren’t quite that game.

When the expanded soap first comes out it is a little rubbery in texture, but that soon changes to being fairly brittle/ flakey. The soap is still usable afterwards too, so you don’t have to throw it out.

SIDE NOTE: I would HIGHLY recommend getting unscented bars. It appears I accidentally bought the scented ones & I have to say that I am NOT a fan. You can’t buy just one bar on it’s own, but thankfully, we have other friends with kids, who are keen to have some.

This entry was posted in Home Schooling, Science. Bookmark the permalink.

Leave a Reply