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Focus sound through a balloon! In this Exploratorium activity, you'll use dry ice to create a balloon that's a sound lens.
- 5 to 10 minutes
- 5 to 10 minutes
- $1 - $5 per student
- Ages 6 - adult
- Activity
- English
Quick Guide
Materials List (per student)
- Sturdy balloon, 12 to 16 inches (30 to 40 centimeters) in diameter
- A way to fill the balloon with carbon dioxide (CO2) just before use, such as a tank of carbon dioxide or with dry ice.
- Crushed dry ice (if no CO2 tank)
- Thick, lined leather gloves (if no CO2 tank)
- Tongs (if no CO2 tank)
- A flask or 1- or 2-liter plastic soda bottle
- Optional: Toy metal clicker or other noisemaker such as a radio or cell phone
Subjects
-
Physical Sciences
- Chemistry
-
States of Matter
- Gases
-
Structure and Properties of Matter
- Volume and Density
-
Vibration and Waves
- Sound
Other
This resource is part of:
Access Rights:
- Free access
By:
Rights:
- Creative Commons: Non-commercial Share Alike (by-nc-sa), Exploratorium Teacher Institute,