"The Univeristy of Chicago"

"Resonant Frequency Bottle Experiment"

"No sound is heard"

A woman blows silently, and nods

"Air through an empty bottle"

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

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

"Same bottle half filled with water"

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

She puts down the bottle and sits back.

"Same bottle filled to the top with water."

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

She puts down the bottle.

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