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helium I

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helium I [′hē·lē·əm ′wən]
(cryogenics)
The phase of liquid helium-4 which is stable at temperatures above the lambda point (about 2.2 K) and has the properties of a normal liquid, except low density.
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Helium is much less dense than air, which is why helium filled balloons float, but it also means that sound can travel even faster through it at around 900 meters per second.
Professor Science by Evening Chronicle (Newcastle, England)
Worldwide demand for helium is ballooning," says Bureau of Land Management spokesman Hans Smart.
Out of gas by Binns, Corey / Science World
R&D: A worldwide shortage of helium is driving prices of the element higher, forcing helium users in many industries to adapt.
R&D by Instrument Business Outlook
 
 
 
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