Two fluid model for helium
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The two fluid model describes the fraction of normal Helium 3 to the fraction of superconducting Helium 4 as it approaches absolute zero. The density of the Helium is described by: ρ = ρn + ρs where ρn is the density of the normal 3He component and ρs is the density of the superconducting 4He component.
As the temperature of the liquid approaches absolute zero (0Kelvin) the fraction of 4He increases towards the total amount.
In this superfluid 4He the entropy, S, and viscosity, η, are both zero.
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