Blubber is a type of fat that acts as an "insulator" (reduces the flow of heat) for animals like whales, walruses, seals or polar bears. To demonstrate how it helps them to keep warm, you can make a blubber mitt.

1. Put some lard (fat) in a Ziploc sandwich bag.

2. Turn a second bag inside out and insert it into the first bag.

3. "Zip" the two bags together, trapping the fat in between them like a layer of blubber. Tape the gap on either side to make the mitt airtight.

4. Put your hand inside the mitt and spread the "blubber" in an even layer.

By putting your mitt covered hand in a bowl of very cold water (with ice cubes), you will be able to see how blubber helps animals survive in the cold Arctic environment.

Try these experiments: "Blubber Mania"