The Superfluidity of Liquid Helium
Helium is a particularly simple, stable and symmetric atom. The K shell is filled by two is electrons which are closely bound to the nucleus: its ionization potential of 24.5 eV is larger than for any other atom. Transitions between atomic levels caused by thermal excitation have a very low probability for temperatures below 103 K.
KeywordsEntropy Vortex Enthalpy Attenuation Helium
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