T K		Vapor Pressure kPa	B(T) cm3·mol-1	dB/dT · T cm3·mol-1	C(T) cm6·mol-2	dC/dT · T cm6·mol-2	mW/(m·K)	µPa·s
Estimated Uncertainty	1%	1%	Gas densities are calculated to better than 0.1% over the temperature and pressure ranges of the reference.				5%	5%
Reference	[2]	[4]	[5]	[5]	[5]	[5]	[6]	[7,8]
240	3.94	105.14	-457.6	990.9	-53928	548995	16.8	10.8
250	3.97	159.80	-419.2	893.9	-34941	390113	17.3	11.2
260	4.00	234.33	-385.8	812.1	-21911	280192	17.8	11.7
270	4.03	333.02	-356.5	742.2	-12871	202823	18.3	12.2
280	4.05	460.43	-330.6	682.2	-6549	147542	18.7	12.6
290	4.07	621.30	-307.6	630.1	-2106	107524	19.2	13.1
300	4.09	820.54	-287.0	584.5	1020	78223	19.7	13.5
310	4.11	1063.14	-268.5	544.5	3214	56561	20.1	14.0
320	4.13	1354.20	-251.8	509.1	4742	40412	20.5	14.4
330	4.15	1698.86	-236.6	477.5	5791	28292	21.0	14.8
340	4.16	2102.36	-222.8	449.3	6494	19146	21.4	15.3
350	4.18	2569.99	-210.1	423.9	6944	12216	21.8	15.7
360	4.19	3107.13	-198.5	401.0	7211	6953	22.2	16.1
370	4.21	3719.29	-187.8	380.3	7345	2951	22.6	16.6
380	4.22	4412.14	-177.9	361.4	7381	-88	23.0	17.0
390	4.23	5191.52	-168.8	344.1	7348	-2390	23.4	17.4
400	4.24	6063.50	-160.3	328.3	7264	-4123	23.8	17.8
410	4.26	7034.44	-152.3	313.8	7146	-5415	24.2	18.2
420	4.27	-	-144.9	300.4	7003	-6365	24.6	18.7
430	4.28	-	-138.0	288.0	6845	-7049	24.9	19.1
440	4.28	-	-131.5	276.6	6677	-7526	25.3	19.5
450	4.29	-	-125.4	265.9	6504	-7839	25.7	19.9
460	4.30	-	-119.7	256.0	6330	-8027	26.0	20.3
470	4.31	-	-114.3	246.7	6156	-8115	26.4	20.7
480	4.32	-	-109.2	238.0	5985	-8127	26.7	21.1
490	4.33	-	-104.4	229.9	5818	-8079	27.1	21.5
500	4.33	-	-99.8	222.3	5655	-7985	27.4	21.9
550	4.37	-	-80.2	190.4	4930	-7146	29.1	23.9
600	4.39	-	-64.7	166.0	4352	-6123	30.8	25.8
650	4.42	-	-52.2	146.9	3901	-5165	32.3	27.7
700	4.44	-	-41.9	131.5	3549	-4337	33.8	29.5
750	4.45	-	-33.3	118.9	3274	-3643	35.2	31.3
800	4.47	-	-26.0	108.4	3058	-3068	36.6	33.1
850	4.48	-	-19.7	99.4	2887	-2593	38.0	34.8
900	4.49	-	-14.2	91.8	2750	-2201	39.3	36.6
950	4.50	-	-9.4	85.2	2640	-1876	40.6	38.2
1000	4.51	-	-5.2	79.4	2551	-1606	41.9	39.9

References:

1. IUPAC; "Atomic Weights of the Elements 1993"; J. Phys. Chem. Ref. Data 1995, 24, 1561.
2. "Selected Values of Properties of Chemical Compounds", Data Project; Thermodynamics Research Center, Texas A&M University, College Station, Texas, 1980-extant. loose-leaf data sheets.
3. J. F. Mathews, "The Critical Constants of Inorganic Substances", Chem. Rev. 1972, 72, 71.
4. D. R. Stull, "Vapor Pressure of Pure Substances", Ind. Eng. Chem. 1947, 39, 517
5. J. J. Hurly, Unpublished Results.
6. R. W. Powell, P. E. Liley, C. Y. Ho, "Thermal Conductivity of the Elements", J. Phys. Chem. Ref. Data 1972, 1, 279.
7. T. H. Laby, G. W. C. Kaye, "Tables of Physical and Chemical Constants, 14th ed.", Longman Group, Limited, London, 1973.
8. "Matheson Gas Data Book, unabridged ed.", Matheson Company, Inc., East Rutherford, New Jersey, 1974.

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