Set up all experiments with a friend who you have met through the World Wide Web or on a video conference. Each of you produce the experiments at your location, then when the experiments are finished link up and compare notes.

Buoyancy: Why sharks swim to stay afloat.

You will need:

1) one sink or bath tub filled with water
2) two balloons
3) 8 oz. corn or vegetable oil

Take one balloon and fill it with air. Take the other balloon and fill it with the 8 oz of oil. Place both balloons in the water (in your sink or bath tub).

Which balloon sinks?
Which balloon floats?