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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. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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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. Since helium is lighter than regular air, it vibrates faster, creating faster-moving sound waves. Helium is a directory of real-world knowledge powered by people like you. |
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