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# Diffusion Coefficient

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### Fourier Number for Mass Transfer

Wolfram Research

The Fourier number is a dimensionless number that characterizes transient heat conduction. Conceptually, it is the ratio of diffusive or conductive transport rate to the quantity storage rate, where the quantity may b...

### Lewis Number Using Thermal Diffusivity

Wolfram Research

The Lewis number is a dimensionless number defined as the ratio of thermal diffusivity to mass diffusivity. It is used to characterize fluid flows where there is simultaneous heat and mass transfer.

### Lewis Number Using Thermal Conductivity

Wolfram Research

The Lewis number is a dimensionless number defined as the ratio of thermal diffusivity to mass diffusivity. It is used to characterize fluid flows where there is simultaneous heat and mass transfer.

### Mean Free Path Using Pressure

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The mean free path is the average distance traveled by a moving particle (such as an atom, a molecule or a photon) between successive impacts (collisions), which modifies its direction, energy or other particle proper...

### Mean Free Path Using Electron Density

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The mean free path is the average distance traveled by a moving particle (such as an atom, a molecule or a photon) between successive impacts (collisions), which modifies its direction, energy or other particle proper...

### Péclet Number for Mass Transfer

Wolfram Research

The Péclet number is a class of dimensionless numbers relevant in the study of transport phenomena in a continuum. It is defined to be the ratio of the rate of advection of a physical quantity by the flow to the rate ...

### Schmidt Number Using Kinematic Viscosity

Wolfram Research

The Schmidt number is a dimensionless number defined as the ratio of momentum diffusivity (kinematic viscosity) and mass diffusivity, and is used to characterize fluid flows in which there are simultaneous momentum an...

### Schmidt Number Using Dynamic Viscosity

Wolfram Research

The Schmidt number is a dimensionless number defined as the ratio of momentum diffusivity (kinematic viscosity) and mass diffusivity, and is used to characterize fluid flows in which there are simultaneous momentum an...

### Swelling Interface Number

Wolfram Research

The swelling interface number is important in describing the relationship between solvent penetration and solute diffusion.