Talk:Mass diffusivity
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"diffusion coefficient" may be a misleading name
The article states that "diffusion coefficient" is another way to say "diffusivity". Diffusivity has units of (meter*meter/second). In the CFD books i looked up "diffusion coefficient" has the units of (kilogram/(meter*second)).
In other words, the "diffusion coefficient" described there is the dynamic viscosity, and the "diffusivity" is the kinematic viscosity. What i want to say with this is that "diffusion coefficient" is not another name for "diffusivity" but another constant 94.66.56.254 (talk) 18:11, 17 November 2020 (UTC)
Gas formula
The formula for D in a gas is somewhat unclear. Looks like a single molecule of helium in 100% CO2 has the same D as a single molecule of CO2 in 100% He? Seems unlikely. Therefore, what are M_1 and M_2 really? 2600:1700:8786:DA0:41EF:DE84:6BA4:5087 (talk) 21:09, 12 July 2022 (UTC)