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helium II

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helium II [′hē·lē·əm ′tü]
(cryogenics)
The phase of liquid helium-4 which is stable at temperatures between absolute zero and the lambda point (about 2.2 K), and has many remarkable properties such as vanishing viscosity, extremely high heat conductivity, and the fountain effect.


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A sampling of topics of subsequent chapters: high pressure effects, band structure parameters, high-energy radiation, solutes, superfluid helium II, electric discharges, principles of production and ultra purification, helium droplets, and electron and ion mobility.
 
 
 
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