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^{1}Geothermal Research Institute of the Dagestan Scientific Center RAS, Makhachkala, Russia

^{2}Moscow Power Engineering Institute (Technical University), Moscow, Russia

^{3}Xi'an Jiaotong University, Xi'an, P.R. China

**Keywords:** coexistence curve, scaling theoryliquid density, gas density, saturation pressure, critical exponents, critical point**property:** liquid density, gas density, saturation pressure, derivatives**material:** diethyl ether

New experimental data by Abdulagatov et al. [1] on saturated properties, *F* = (the saturated densities, *ρ**l*, *ρ** _{g}*, the vapor pressure,

A new analytical form to express *F* is studied. It has a combined structure [2] with scaling and regular parts

*F*(*τ**,D,B*)* = F*(*τ**,D,B*1)* _{scale }+ F*(

here *τ** = *(*T _{c} - T*)

Combined models of *F* = (*f _{s}*,

*f _{s} = B_{s0}τ*

*f _{d}*

here *Δ* – non-asymptotic critical exponent (a Wegner correction).

Combined models of *F *=* *(*ρ** _{l}*,

*ρ** _{l}* = (

Adjustable coefficients, *B*, and characteristics *D = *(*a*,*β*,*T _{c}*,

We have considered equations suggested by Wagner, 1973, Xiang and Tan, 1994, and Wu et al., 2005, Abdulagatov et al., 2011, and other models those can describe *F* = *P _{s}*. A combined model (1) is built in the form [2] to represent experimental (

Some application results are determined and discussed. They are got with the help of the models and connected with thermodynamic properties on the coexistence curve of *DEE*. The work is supported by RFBR.

- N.G. Polikhronidi, I.M. Abdulagatov, R.G. Batyrova, G.V. Stepanov, E.E. Ustuzhanin, J.T. Wu. Int. J. Thermophys. 32, 189 (2011)
- Ustjuzhanin E.E., V.F. Utenkov, V.A. Rykov. Soft matter under exogenic impact. NATO Science series. Part II, Vol. 242. Editor Rzoska S. Eddition - Springer, The Netherlands, (2006)

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