What is diffusion?

  • (noun): The act of dispersing or diffusing something.
    Example: "The diffusion of knowledge"
    Synonyms: dispersion, dispersal, dissemination
    See also — Additional definitions below


Diffusion is one of several transport phenomena that occur in nature. A distinguishing feature of diffusion is that it results in mixing or mass transport without requiring bulk motion. Thus, diffusion should not be confused with convection or advection, which are other transport mechanisms that use bulk motion to move particles from one place to another. In Latin, "diffundere" means "to spread out".

Read more about Diffusion.

Some articles on diffusion:

Convection–diffusion Equation
... The convection–diffusion equation is a combination of the diffusion and convection (advection) equations, and describes physical phenomena where particles, energy, or other physical quantities are ... Depending on context, the same equation can be called the advection–diffusion equation, drift–diffusion equation, Smoluchowski equation (after Marian ...
Surface Diffusion - Kinetics
... Surface diffusion kinetics can be thought of in terms of adatoms residing at adsorption sites on a 2D lattice, moving between adjacent (nearest-neighbor) adsorption ... dependent on temperature and Ediff, the potential energy barrier to diffusion ... Ediff must be smaller than the energy of desorption for diffusion to occur, otherwise desorption processes would dominate ...
Diffusion in Physics - Other Types of Diffusion
... Anisotropic diffusion, also known as the Perona-Malik equation, enhances high gradients Anomalous diffusion, in porous medium Atomic diffusion, in ... Knudsen diffusion of gas in long pores with frequent wall collisions Momentum diffusion ex ... the diffusion of the hydrodynamic velocity field Photon diffusion Random walk, model for diffusion Reverse diffusion, against the concentration gradient, in phase separation Rotational diffusion ...

More definitions of "diffusion":

  • (noun): The property of being diffused or dispersed.
    Synonyms: dissemination
  • (noun): (physics) the process of diffusing; the intermingling of molecules in gases and liquids as a result of random thermal agitation.
  • (noun): The spread of social institutions (and myths and skills) from one society to another.