Neon

References

Equation of State

M. Thol, R. Beckmüller, R. Weiss, A.H. Harvey, E.W. Lemmon, R.T. Jacobsen, and R. Span. Thermodynamic properties for neon for temperatures from the triple point to 700 k at pressures to 700 mpa. J. Phys. Chem Ref. Data, 2019, Submitted.

Melting Line

Ian H. Bell. Melting line correlation for neon. 2026. Polynomial-in-theta correlation, p = p_t [1 + sum_i a_i (T/T_t - 1)^t_i], fit to the solid-liquid (crystal phase C1) melting data evaluated in the NIST ThermoData Engine (Frenkel et al., J. Chem. Inf. Model. 45, 816 (2005)). The triple point (T_t = 24.556 K, p_t = 43.417 kPa) and the saturated-liquid molar volume are taken from the Thol et al. neon EOS (J. Phys. Chem. Ref. Data 48, 023101 (2019)) as implemented in CoolProp. The leading linear term is constrained so that the slope at the triple point matches the Clausius-Clapeyron value dp/dT = dS_fus/dV_fus = 6.28 MPa/K, using dH_fus = 335 J/mol and a solid density of 1.444 g/cm^3. The correlation reproduces the experimental melting temperatures to 0.97 K RMS (3.0 K maximum) over 24.6-328 K, and supersedes the prior fit that was high by roughly a factor of 16. Crystal phase: neon has a single solid phase (fcc, C1) along the melting line in this range, so no phase ambiguity arises.

Surface Tension

A. Mulero, I. Cachadiña, and M. I. Parra. Recommended Correlations for the Surface Tension of Common Fluids. J. Phys. Chem. Ref. Data, 41(4):043105–1:13, 2012. doi:10.1063/1.4768782.

Aliases

neon, NEON, R720

Molecular Structure

Neon — 2D structure (interactive: click and drag to rotate)

Fluid Information

Parameter, Value
General
Molar mass [kg/mol]	0.020179
CAS number	7440-01-9
ASHRAE class	A1
Formula	Ne
Acentric factor	-0.03549258024442481
InChI	InChI=1S/Ne
InChIKey	GKAOGPIIYCISHV-UHFFFAOYSA-N
SMILES	[Ne]
ChemSpider ID	22377
Limits
Maximum temperature [K]	725.0
Maximum pressure [Pa]	1000000000.0
Triple point
Triple point temperature [K]	24.560000000000002
Triple point pressure [Pa]	43417.232458065846
Critical point
Critical point temperature [K]	44.39999970498691
Critical point density [kg/m3]	486.31370002144575
Critical point density [mol/m3]	24099.990089768857
Critical point pressure [Pa]	2661630.706279463

REFPROP Validation Data

Note

This figure compares the results generated from CoolProp and those generated from REFPROP. They are all results obtained in the form \(Y(T,\rho)\), where \(Y\) is the parameter of interest and which for all EOS is a direct evaluation of the EOS

You can download the script that generated the following figure here: (link to script), right-click the link and then save as… or the equivalent in your browser. You can also download this figure as a PDF.

Consistency Plots

The following figure shows all the flash routines that are available for this fluid. A red + is a failure of the flash routine, a black dot is a success. Hopefully you will only see black dots. The red curve is the maximum temperature curve, and the blue curve is the melting line if one is available for the fluid.

In this figure, we start off with a state point given by T,P and then we calculate each of the other possible output pairs in turn, and then try to re-calculate T,P from the new input pair. If we don’t arrive back at the original T,P values, there is a problem in the flash routine in CoolProp. For more information on how these figures were generated, see CoolProp.Plots.ConsistencyPlots

Note

You can download the script that generated the following figure here: (link to script), right-click the link and then save as… or the equivalent in your browser. You can also download this figure as a PDF.

Flash consistency (HEOS): 0 inconsistent, 21 exceptions, 0 bad-phase across 1 input pair(s).

Download full failure list (CSV)

Failing state points (sample, up to 20 per pair/class)

Pair	Class	Region	P [Pa]	T [K]	In1	Val1	In2	Val2	Error
DmolarP	EXCEPTION	1phase	7.73136e+08	660.3	Dmolar	53459	P	7.73136e+08	The temperature of -4964.467257 K is below the minimum of 0.000000 K
DmolarP	EXCEPTION	1phase	7.73136e+08	676.475	Dmolar	52952.6	P	7.73136e+08	The temperature of -90.258805 K is below the minimum of 0.000000 K
DmolarP	EXCEPTION	1phase	7.73136e+08	692.65	Dmolar	52457.7	P	7.73136e+08	The temperature of -213.545794 K is below the minimum of 0.000000 K
DmolarP	EXCEPTION	1phase	7.73136e+08	708.825	Dmolar	51973.8	P	7.73136e+08	The temperature of -337.909846 K is below the minimum of 0.000000 K
DmolarP	EXCEPTION	1phase	7.73136e+08	725	Dmolar	51500.4	P	7.73136e+08	The temperature of -442.716051 K is below the minimum of 0.000000 K
DmolarP	EXCEPTION	1phase	1e+09	488.372	Dmolar	66150	P	1e+09	The temperature of -353.686620 K is below the minimum of 0.000000 K
DmolarP	EXCEPTION	1phase	1e+09	504.148	Dmolar	65508.3	P	1e+09	The temperature of -2811.822334 K is below the minimum of 0.000000 K
DmolarP	EXCEPTION	1phase	1e+09	519.923	Dmolar	64882.6	P	1e+09	The temperature of -25482.380428 K is below the minimum of 0.000000 K
DmolarP	EXCEPTION	1phase	1e+09	535.698	Dmolar	64272.3	P	1e+09	The temperature of -10391.808865 K is below the minimum of 0.000000 K
DmolarP	EXCEPTION	1phase	1e+09	551.473	Dmolar	63677	P	1e+09	The temperature of -6778.930360 K is below the minimum of 0.000000 K
DmolarP	EXCEPTION	1phase	1e+09	567.248	Dmolar	63095.9	P	1e+09	The temperature of -5165.648676 K is below the minimum of 0.000000 K
DmolarP	EXCEPTION	1phase	1e+09	583.023	Dmolar	62528.6	P	1e+09	The temperature of -4257.286805 K is below the minimum of 0.000000 K
DmolarP	EXCEPTION	1phase	1e+09	598.799	Dmolar	61974.4	P	1e+09	The temperature of -3678.529861 K is below the minimum of 0.000000 K
DmolarP	EXCEPTION	1phase	1e+09	614.574	Dmolar	61433	P	1e+09	The temperature of -3280.385617 K is below the minimum of 0.000000 K
DmolarP	EXCEPTION	1phase	1e+09	630.349	Dmolar	60903.8	P	1e+09	The temperature of -2991.929983 K is below the minimum of 0.000000 K
DmolarP	EXCEPTION	1phase	1e+09	646.124	Dmolar	60386.4	P	1e+09	The temperature of -2775.093515 K is below the minimum of 0.000000 K
DmolarP	EXCEPTION	1phase	1e+09	661.899	Dmolar	59880.3	P	1e+09	The temperature of -2607.610912 K is below the minimum of 0.000000 K
DmolarP	EXCEPTION	1phase	1e+09	677.674	Dmolar	59385	P	1e+09	The temperature of -2475.592769 K is below the minimum of 0.000000 K
DmolarP	EXCEPTION	1phase	1e+09	693.45	Dmolar	58900.3	P	1e+09	The temperature of -2369.929489 K is below the minimum of 0.000000 K
DmolarP	EXCEPTION	1phase	1e+09	709.225	Dmolar	58425.7	P	1e+09	The temperature of -2284.403949 K is below the minimum of 0.000000 K

Superancillary Plots

The following figure shows the accuracy of the superancillary functions relative to extended precision calculations carried out in C++ with the teqp library. The results of the iterative calculations with REFPROP and CoolProp are also shown.

Note

You can download the script that generated the following figure here: (link to script), right-click the link and then save as… or the equivalent in your browser. You can also download this figure as a PDF.