**R143a**

R143a provides high accuracy thermodynamic properties for R143a (1,1,1-trifluoroethane) using the fundamental equation of state presented in:

An International Standard Formulation for the Thermodynamic Properties of 1,1,1-trifluoroethane (R143a) for Temperatures from 161 to 450 K and Pressures up to 50 MPa.

Lemmon, E.W. and Jacobsen, R.T.,

J. Phys. Chem. Ref. Data, Vol. 29, No. 4, 2000

Ancillary routines are vapor pressure and saturated liquid and vapor densities are also provided in the above reference.

The values of specific enthalpy and entropy are, by default, referred to 200 kJ/kg and 1.00 kJ/kg-K, respectively for the state of saturated liquid at 273.15 K. The reference state can be changed using the $Reference directive.

__Range of applicability for transport function correlations:__

Gas-phase viscosity: 200 K to 650 K

Liquid-phase viscosity: 170 K to 340 K

Gas-phase thermal conductivity: 200 K to 650 K

Liquid-phase thermal conductivity: 170 K to 340 K

__Surface tension data are from: __

Schmidt, J.W., Carrillo-Nava, E., and Moldover, M.R.,

"Partially halogenated hydrocarbons CHFCl-CF3, CF3-CH3, CF3-CHF-CHF2, CF3-CH2-CF3, CHF2-CF2-CH2F, CF3-CH2-CHF2, CF3-O-CHF2: Critical temperature, refractive indices, surface tension and estimates of liquid, vapor and critical densities,"

Fluid Phase Equilibria, 122:187-206, 1996.