Make an Iceberg

Buoyancy

Things You Will Need
• Balloon
• Plastic bag
• A freezer
• Scissors
• Deep bucket or large bowl
• Water
• Salt

Do This

1. Fit the balloon over the nozzle of the cold-water faucet and fill it with water.
2. Tie the end of the balloon to seal the water inside.
3. Put the balloon inside a plastic bag (without holes) and place in a freezer overnight.
4. Next morning, take the balloon out of the freezer. Use the scissors to cut away the balloon carefully.
5. Fill the deep bucket or large bowl 3/4 full with water.
6. Add about 5-10 tablespoons of salt to the water.
7. Put your iceberg in the deep bucket or bowl of saltwater.

What Should Have Happened

Your iceberg should have floated, but only a small portion of the whole iceberg should have remained at the surface. Only about a tenth of a real iceberg shows above the surface of water. Your iceberg should have been similar. This makes icebergs very dangerous to ships.