CODATA Recommended Values of the Fundamental Physical Constants: 2014

Abstract

This paper gives the 2014 self-consistent set of values of the constants and conversion factors of physics and chemistry recommended by the Committee on Data for Science and Technology (CODATA). These values are based on a least-squares adjustment that takes into account all data available up to 31 December 2014. Details of the data selection and methodology of the adjustment are described. The recommended values may also be found at http://physics.nist.gov/constants.

Models for viscosity, thermal conductivity, and surface tension of selected pure fluids as implemented in REFPROP v10.0

“…where the dilute-gas viscosity is η* in Pa·s, m is the molecular mass in kg, k B is the Boltzmann constant (1.38064852x10 -23 m 2 ·kg·s -2 ·K -1 ) (Mohr, Newell, & Taylor, 2016),  is a collision diameter in m, and T is the absolute temperature in K. We will further assume that a Lennard-Jones 12-6 potential applies, and use the Lennard-Jones collision diameter for . Neufeld et al (Neufeld, Janzen, & Aziz, 1972) gave the following empirical correlation (neglecting the sinusoidal term) for the calculation of the collision integral  (2,2) (7) with the dimensionless temperature T * = k B T/ε, and  the minimum of the Lennard-Jones pairpotential energy.…”

“…leading to the following expression for the thermal conductivity ) , ( where Cp* is the ideal-gas heat capacity (in J·mol -1 ·K -1 ), R is the molar gas constant (Mohr et al, 2016) (8.314 472 J· mol -1 ·K -1 ), η* is the dilute-gas viscosity (µPa·s) as given in Eq. (8), fint is set to 1.32x10 -3 , and λ is in W·m -1 ·K -1 .…”

Reference Correlation for the Viscosity of Carbon Dioxide

“…(4), the temperature-dependent reduced second viscosity virial coefficient $B_{\eta }^{\ast }(T^{\ast })$ as detailed below, the length scaling parameter σ in meters, the Avogadro constant 89 N A = 6.022 140 857(74)×10 23 mol −1 , and the molar mass of CO 2 M = 44.0095×10 −3 kg mol −1 . The temperature dependence of the reduced second viscosity virial coefficient $B_{\eta }^{\ast }(T^{\ast })$ was theoretically calculated for the Lennard-Jones 12-6 potential by Rainwater and Friend 90, 91 and later adjusted to experimental results by Vogel and Hendl.…”

“…Therefore, the reduced temperature T r = T / T t is formed here with the triple-point temperature of CO 2 , T t = 216.592 K, and the reduced density ρ r = ρ / ρ tL with the density of the liquid phase at the triple point, 21 ρ tL = 1178.53 kg m −3 . The molar gas constant is R = 8.314 4598(48) J mol −1 K −1 and the Boltzmann constant k B = 1.380 648 52(79) × 10 −23 J K −1 89 . The molar mass M of CO 2 and the Avogadro constant N A have been given in Section 5.2; m denotes the mass of a molecule m = M / N A .…”

Improving the accuracy of the muon mass and magnetic moment anomaly via the bound-muon g factor

“…Also, for the sake of simplicity both on the experimental and the theoretical side, the nucleus is assumed to be spinless. Since currently the mass of the muon is only known from muonium spectroscopy [26,27] and to a fractional standard uncertainty of 2.2 × 10 −8 [28,29], alternative methods for its determination are especially desirable.…”