100 + STEAM Experiments:
The experiments in this book are organized by STEAM categories: Science, Technology, Engineering, Art, and Math. However, all of these fields are connected to each other in numerous ways. This book is designed to be like real life by showing the interplay among all of the STEAM disciplines.
The Big Question: How Does a Hot Air Balloon Work?
Level of Difficulty: Easy, Time: 10 Minutes, Category: Science
How does a hot air balloon fly in the air? Learn about air density by building and launching your own tea bag hot air balloon.
1. Use scissors to cut the tea bag open on the side attached to the string. Dump the contents into a mug to use later or discard.
2. Shape the tea bag into a cylinder and stand it up on a glass plate.
3. Use a match to light the top of the tea bag on fire.
The Hows and Whys:
When air is heated, the air molecules move around quickly and spread out. This makes hot air rise because it is less dense than cold air. When the tea bag is lit on fire, it heats up the air inside and around the paper to such an extent that a warm air current lifts up the lightweight tea bag. A hot air balloon works the same way: by heating up trapped air in the balloon to make it fly above the ground.
- Tea bag with string attached
- Glass Plate