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[http://www.nycvp.com/frames/theater/thanksgiving_parade_info.htm/ Parade Info] | [http://www.nycvp.com/frames/theater/thanksgiving_parade_info.htm/ Parade Info] | ||
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*Zeppelins | |||
*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==== | ||
====For Cooling Systems of superconductors==== | |||
Liquid helium is used to cool certain metals to the extremely low temperatures required for superconductivity, such as in superconducting magnets for magnetic resonance imaging. | |||
Liquid helium is used to cool the superconducting magnets in modern MRI scanners. | |||
The superconducter at CERN uses 96 metric tons of liquid helium to maintain the temperature at 1.9 kelvins | |||
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