# Diffusion of low-density gases with equal mass

## Input(s)

$$\mathrm{T}$$: Temperature $$(\mathrm{K})$$

$$\boldsymbol{M}_{\boldsymbol{A}}$$: Mass of Component A $$(\mathrm{g})$$

$$\boldsymbol{M}_{\boldsymbol{B}}$$: Mass of Component B $$(\mathrm{g})$$

$$\boldsymbol{\sigma}_{\boldsymbol{A} \boldsymbol{B}}:$$ Collision Diameter $$(\mathrm{cm})$$

P: Pressure (atm)

$$\Omega$$: Collision integral (dimensionless)

## Output(s)

$$\mathbf{D}_{\boldsymbol{A} \boldsymbol{B}}$$: Diffusivity $$\left(\mathrm{cm}^{2} / \mathrm{s}\right)$$

## Formula(s)

$\mathrm{D}_{\mathrm{AB}}=0.0018583 *\left(\left(\left(\mathrm{~T}^{3}\right) *\left(\left(\frac{1}{\mathrm{M}_{\mathrm{A}}}\right)+\left(\frac{1}{\mathrm{M}_{\mathrm{B}}}\right)\right)\right)^{0.5}\right) *\left(\frac{1}{\mathrm{P} *\left(\sigma_{\mathrm{AB}}^{2}\right) * \Omega}\right)$

## Reference(s)

Bird, R.B., Stewart, W.E. and Lightfoot, E.N. (2002). Transport Phenomena (Second Ed.). John Wiley & Sons, Chapter: 17, Page: 526.

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