Unified equation of state of He3–4He liquid mixtures over the whole concentration range at temperatures of 2.25–4.2 K and pressures up to 10 MPa

A unified empirical equation of state for He3–4He mixtures is found in analytical form on the basis of the existing experimental P–V–T data for pure He3, He4, and their mixtures in the homogeneous liquid phase in the temperature interval 2.25–4.2 K and pressure interval 0–10 MPa. An algorithm for calculating the fitting coefficients of an approximating expression for P(V,T,c) is constructed. The average absolute error for the determination of P is ±0.015 MPa.