Fick's Law for Steady-State Diffusion
Calculates the molar and mass diffusion rates of a species through a stagnant medium under steady-state conditions using concentration gradients derived from partial pressures.
📖 Need the theory? Read the methodology, assumptions, and equations in the full reference guide.
1. Define Input Parameters
2. Engineering Output
Absolute Temperature (T_k)
- K
- K
Upstream Molar Concentration (C1)
- kmol/m³
- kmol/m³
Downstream Molar Concentration (C2)
- kmol/m³
- kmol/m³
Molar Diffusion Rate (N_dot)
- kmol/s
- kmol/s
Mass Diffusion Rate (kg/s) (m_dot_s)
- kg/s
- kg/s
Mass Diffusion Rate (mg/h) (m_dot_h)
- mg/h
- mg/h
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Download Offline Excel CalculationContext & Assumptions
Fick’s first law quantifies the steady-state movement of species through a medium based on constant concentration gradients. It is a fundamental tool in process engineering for sizing membranes, predicting solvent losses, and designing catalytic layers. The law serves as the mass-transfer analogue to Ohm's law, linking driving force to molar flux.
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