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"The Univeristy of Chicago"

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"Resonant Frequency Bottle Experiment"

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"No sound is heard"

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A woman blows silently, and nods

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"Air through an empty bottle"

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The woman picks up a bottle, smiling, 
and brings it to her lips.

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"220 hz" appears as she blows in it.
She smiles and puts down the bottle.

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"Same bottle half filled with water"

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The woman picks up the bottle.
"316 hz" appears as she blows in it.

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She puts down the bottle and sits back.

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"Same bottle filled to the top with water."

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The woman picks up the bottle. 
"624 hz" appears as she blows in it.

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She puts down the bottle.

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"The University of Chicago" 
"© 2014 The University of Chicago"