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Friday Fun: Things you can microwave July 17, 2015

Posted by mareserinitatis in Friday Fun, homeschooling, science, younger son.
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Most people are familiar with the concept of microwaving a grape to make an arc.  If not, the procedure is very simple: cut a grape in half but leave just a small bit of skin to connect to the two halves.  Put the grape on a plate in the microwave, turn it on, and watch the sparks fly.  (As a side note, I’ve been able to replicate this on a smaller scale when microwaving green beans.)  This video explains it fairly clearly:

This week, we discovered another fun microwaving activity: soap.  I can’t be just any soap: it specifically has to be Ivory soap.  Apparently it gets hot and the gas bubbles expand causing it to create a hot foam which grows fairly quickly.  You can’t do it with other soaps, however, because they’re too hard and will explode.

We used a whole bar of soap with our experiment, but the younger son told us later that the demo he saw only used a smaller chunk.  Be careful after you pull it out of the microwave: it’s hot!  Also, once it’s cooled, you can use the soap, although it may be more useful to stick it into a soap sleeve than try to use it directly.

It looked like this when we were finished:

Ivory soap that has just been microwaved.

Ivory soap that has just been microwaved.

 

To see the whole process, the video is here.

 

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