The experiment shows that in the superfluid $^{4}$He, $^{4}$He atoms are not an ideal Bose gas, and there is a strong correlation between the $^{4}$He atoms in the superfluid state. The famous Tisza and Landau's two-fluid model does not provide an answer to the physical mechanism behind this correlation. This paper proposes a hypothesis—Physicalized Temperature (PT), a specific mechanism for the correlation between $^{4}$He atoms. Based on this model, new explanations are given for critical opalescence and the quantization of circulation; it is also predicted that, similar to superconductors, magnetic flux quantization will occur in a rotating torus container filled with superfluid $^{4}$He. The phonon-roton dispersion curve (P-R curve) of the superfluid $^{4}$He quasiparticles, which was conjectured by Landau, as well as the specific heat curve with singularities across the entire temperature range, are calculated and found to match the experimental data very well.