Understanding molecular diffusion is crucial in various scientific and engineering disciplines. Our Molecular Diffusion Coefficient Calculator provides a reliable tool to easily determine diffusion coefficients for different substances, aiding in process design, research, and educational applications. Quickly calculate mass transfer.
Formula:
The calculation for the binary diffusion coefficient (D) for gases is based on a simplified Fuller-Schettler-Giddings correlation:
D = 0.001 × T1.75 × √(1/MA + 1/MB) / (P × (VA1/3 + VB1/3)2)
Where:
- D = Binary diffusion coefficient (cm²/s)
- T = Absolute temperature (K)
- MA = Molecular weight of gas A (g/mol)
- MB = Molecular weight of gas B (g/mol)
- P = Absolute pressure (atm)
- VA = Diffusion volume parameter for gas A (cm³/mol)
- VB = Diffusion volume parameter for gas B (cm³/mol)
Note: This formula is typically used for non-polar gases at low to moderate pressures. Diffusion volume parameters (V) are empirical values and can vary.