Do bars of soap sink or float? My kindergarten scientists turned to those sitting beside them and discussed their ideas. Four of the bars sand (including Dove and Dial), but the bars of Jergens and Ivory soap floated. Another scientific discussion followed as the children tried to determine why one bar of soap would float while the other would sink. We concluded that two of the bars must be less dense than water. If it is less dense, could there be air bubbles inside? So, what would happen if we heated the Ivory soap in the microwave for one minute and thirty seconds? Look at the before and after pictures below. There is water trapped inside the air bubbles. When it is heated, the water molecules spread out into a gas and the soap expands because the heat has caused it to become more pliable too. Of course, we had to touch it! The texture surprised us because although it looked like whipped cream or snow, it didn’t feel like those at all. My scientists described the texture as soft, dry, and crumbly. Click here for more information about this investigation.
Will one of my third or fourth graders invent something that will rock our world? They are ready to try! We kicked off our fifth annual Invention Convention. I brought in these inventions to illustrate how inventors improve upon the work of those who come before them. After the Invention Convention, inventions will move to our version of the Show Shark Tank which we call Minnow Tank. Click here to view previous blog posts about the Invention Convention and Minnow Tank. (Scroll down.)
Details about the Invention Convention will come home in Friday folders soon.
Click here to watch inventors share their thoughts on inventing.
Click here to watch Molly, a kid inventor, who became an engineer.
The typewriter was especially interesting to my scientists. I demonstrated how the return, the cap lock, and the space bar work in much the same way as they do on the keyboards we use today.
I am inventing a new student desk. I made these changes last year, and I continue to look for additional ways to bring desks into this century!