Things You Will Need
- 2 balloons
- Blow up a balloon.
- Hold the balloon next to your ear. Hold a watch on the other side of the balloon.
- Can you hear the watch ticking?
- Fill the second balloon with water and repeat the experiment.
- Does the water make the watch ticking sound louder or quieter?
What Should Have Happened
The sound of the watch should have been louder through the water-filled balloon. Sound travels about four times faster through water than it does through air.
Webdate: June 11, 2002
Updated: July 2004
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