Section: 6 | Diffusion in Gases |

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The table 'Diffusion Coefficients for Binary Gas Mixtures as a Function of Temprature at 101.325 kPa' has one or more different columns and 57 more rows than appear in the book.

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DIFFUSION IN GASES

This table gives diffusion coefficients D₁₂ for binary gas mixtures as a function of temperature. Specifically, for molecule 1 diffusing in a binary mixture of molecules 1 and 2 in the absence of temperature and pressure gradients, the flux equation is

J₁ = -nD₁₂Δx₁

where J₁ is the flux density of molecule 1, n is the total number density, and Δx₁ is the composition gradient in terms of mole fraction x₁. A similar equation holds for molecule 2. These equations hold only in the case of zero net flux, J₁ + J₂ = 0; more complicated equations are required in other cases (Refs. 1 and 2). It can be shown D₁₂ = D₂₁ because there is no net flux and x₁ + x₂ = 1.

Values refer to atmospheric pressure. The diffusion coefficient is inversely proportional to pressure as long as the gas is in a regime where binary collisions dominate. See Ref. 1 for a discussion of the dependence of D₁₂ on temperature and composition. Column definitions for the table are as follows.

Column heading	Definition
Mixture	Names of mixture components
D₁₂(-73 °C), D₁₂(0 °C), etc.	Diffusion coefficient, in units cm² s^-1, at temperature (in °C) indicated within the parentheses

The top portion of the table contains diffusion coefficients for eight gases in air; the lower portion of the table contains a selection of common binary gas mixtures.

References

Marrero, T. R., and Mason, E. A., J. Phys. Chem. Ref. Data 1, 1, 1972. [https://doi.org/10.1063/1.3253094]
Kestin, J., et al., J. Phys. Chem. Ref. Data 13, 229, 1984. [https://doi.org/10.1063/1.555703]

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Diffusion Coefficients for Binary Gas Mixtures as a Function of Temprature at 101.325 kPa

Component 1	Component 2	Conditions	D₁₂(-73 °C)/cm² s^-1	D₁₂(0 °C)/cm² s^-1	D₁₂(20 °C)/cm² s^-1	D₁₂(100 °C)/cm² s^-1	D₁₂(200 °C)/cm² s^-1	D₁₂(300 °C)/cm² s^-1	D₁₂(400 °C)/cm² s^-1
Continued on next page...
*Large Excess of Air*
Argon	Air	Excess of air		0.167	0.189	0.289	0.437	0.612	0.810
Methane	Air	Excess of air			0.210	0.321	0.485	0.678	0.899
Carbon monoxide	Air	Excess of air			0.208	0.315	0.475	0.662	0.875
Carbon dioxide	Air	Excess of air			0.160	0.252	0.390	0.549	0.728
Hydrogen	Air	Excess of air		0.668	0.756	1.153	1.747	2.444	3.238
Water	Air	Excess of air			0.242	0.399	0.638	0.873	1.135
Helium	Air	Excess of air		0.617	0.697	1.057	1.594	2.221	2.933
Sulfur hexafluoride	Air	Excess of air				0.150	0.233	0.329	0.438
Equimolar Mixture
Argon	Methane	Equimolar				0.306	0.467	0.657	0.876
Argon	Carbon monoxide	Equimolar		0.168	0.190	0.290	0.439	0.615	0.815
Argon	Carbon dioxide	Equimolar		0.129	0.148	0.235	0.365	0.517	0.689
Argon	Hydrogen	Equimolar		0.698	0.794	1.228	1.876	2.634	3.496
Argon	Helium	Equimolar	0.381	0.645	0.726	1.088	1.617	2.226	2.911
Argon	Krypton	Equimolar	0.064	0.117	0.134	0.210	0.323	0.456	0.605
Argon	Nitrogen	Equimolar		0.168	0.190	0.290	0.439	0.615	0.815
Argon	Neon	Equimolar	0.160	0.277	0.313	0.475	0.710	0.979	1.283
Argon	Oxygen	Equimolar		0.166	0.187	0.285	0.430	0.600	0.793
Argon	Sulfur hexafluoride	Equimolar				0.128	0.202	0.290	0.389
Argon	Xenon	Equimolar	0.052	0.095	0.108	0.171	0.264	0.374	0.498

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DIFFUSION IN GASES

References

Diffusion Coefficients for Binary Gas Mixtures as a Function of Temprature at 101.325 kPa

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