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=====Zeppelins===== | |||
=====Birthday Balloons===== | |||
And of course the effect Helium from birthday Ballons has on the human voice. The speed of sound in helium is nearly three times the speed of sound in air. Because the fundamental frequency of a gas-filled cavity is proportional to the speed of sound in the gas, when helium is inhaled there is a corresponding increase in the pitches of the resonant frequencies of the vocal tract. | |||
====Rockets==== | ====Rockets==== | ||