When Arnold discovers that his cocoa is cold, he demands to know where the hot went. In response, Ms. Frizzle whisks the class to the Arctic. What’s the freezing Arctic got to do with heat? While the kids try to find out, the bus’s engine freezes and the bus floats away on an ice floe with Ralphie and Phoebe inside! As the bus moves away, so does the heat from everyone’s bodies. How can Ms. Frizzle’s kids insulate their bodies to keep the heat in? Can they rescue Ralphie and Phoebe before they all become the Ice Cube Kids?
The Magic School Bus kids are freezing! When they discover that heat flows from hotter to colder things, they find ways to block heat escape routes. Your kids explore how insulation works to keep in body heat.
For each group, tightly seal some ice and water in one zipper bag. Put the shortening in a second bag.
- Spatula or spoon
- Large bowl of ice water
For each group:
- 4 sandwich-size zipper plastic bags
- 12-15 cotton balls
- water and ice
- 1 cup solid shortening
Ask: How do layers of clothes, fur coats, and fat keep humans and animals warm when it’s cold outside? (Fat and trapped air in fur or clothing layers block the flow of body heat into the cold.) |
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In two demonstrations, kids explore how air and fat can slow the flow of body heat into ice water.
In the "Polar Bear Blanket" test, cotton fibers trap body-heated air, much like polar bear fur. Pass out materials. Help kids follow activity-page directions.
Ask: How do polar bears keep warm in the Arctic? (Air spaces in their fur trap body-heated air.) How are the cotton balls like polar bear fur?
The "Walrus Mitt" seals a hand inside a layer of fat to imitate walrus blubber. Pass out materials. Help kids follow activity-page directions. Show how to zip the shortening and empty bags together to make the mitt.
Ask: How do walruses keep warm in icy cold water? (Blubber slows the movement of body heat.)
Challenge kids to insulate jars of warm water so that they keep the heat as long as possible. Dip a finger in each of the jars after an hour. Which stayed the warmest? Why?
("Walrus Mitt" adapted from SuperScience Blue, October 1989)
Click here for the Activity page
