Look up diffusion in Wiktionary, the free dictionary.

Diffusion most often refers to a time-dependent random process causing a spread in space, see diffusion.

In the physical sciences:

• Molecular diffusion (also commonly without additional attributes) - spontaneous dispersion of mass (distinct from migration, caused by an external force)
• Diffusion of heat
• Diffusion of momentum
• Diffusion equation - a mathematical formalism describing the spreading of a conserved property caused by its own density gradient
  • Heat equation
• Eddy diffusion

In physical sciences, more specific or modified meanings:

• Acoustic diffusion of sound waves
• Atomic diffusion
• Brownian motion, for example of a single particle in a solvent
• Collective diffusion, the diffusion of a large number of (possibly interacting) particles
• Facilitated diffusion
• Effusion of a gas through small holes
• Gaseous diffusion
• Itō diffusion
• Knudsen diffusion of particles from very small containers
• Osmosis
• Photon diffusion, an optical effect
  • Diffuse reflection, the reflection of light from an uneven or granular surface
• Reverse diffusion
• Rotational diffusion
• Self-diffusion
• Surface diffusion
• Thermodiffusion

In the social sciences such as sociology, geography, or cultural anthropology:

• Diffusion of innovations within a society or a culture or between them
• Lexical diffusion within a culture
• Trans-cultural diffusion of culture items between cultures
• Spatial diffusion of an innovation, an artifact, or populations between and within territories

In computer science:

• Diffuse reflection, the reflection of light from an uneven or granular surface
• Diffusion (cryptography), the spreading of influence of bits in a cipher
• Error diffusion in image processing

In other areas:

• Diffusion (business), the process by which a new idea or new product is accepted by the market
• Diffusion process, in probability theory the solution to a stochastic differential equation
• Diffusion of responsibility
• Society for the Diffusion of Useful Knowledge
• The Diffusion Science Radio Show is a science radio show on 2SER in Sydney and podcast
• Diffusion Records, an independent record label
• Diffusion (7for4 album), a music album by 7for4.

[edit] See also

• Migration
• Diffuse nebula

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