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helium I

   Also found in: Encyclopedia 0.02 sec.
helium I
n.
Liquid helium existing as a normal fluid between the superfluid transition point of approximately 2.2°K at 1 atmosphere pressure and its boiling point of 4.2°K.


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According to theory, when liquid helium is pushed through a tiny hole at ultracold temperatures, the substance oscillates at a frequency that, when amplified electronically, sounds like a whistle.
A quantum fluid pipes up by Science News
Since helium is lighter than regular air, it vibrates faster, creating faster-moving sound waves.
You Asked.. by Chiang, Mona / Science World
Helium is a directory of real-world knowledge powered by people like you.
Helium Announces Debate at DEMO 2007 by Business Wire
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