SOUND LENS USING A BALLOON
A ballopn full of CO2 gas can act as a sound lens, because sound travels
More slowly in CO2than it does in air ,
Just as light travels more slowly in
Glass than in air or vacuum. Do not use a balloon for this if it is over- inflated,
Or if it contains remaining pieces of dry ice, because the balloon could burst, causing temporary or even permanemt deafness. Hold the balloon about a foot from your ear,
And listen for faint sounds, such as a radio turned low, a ticking clock or a distant
Conversation, to appear louder.
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