Diffusion may refer to:

• Diffusion, the spontaneous spreading of something such as particles, heat, light, or momentum

In the physical sciences:

• Acoustic diffusion of sound waves
• Atomic diffusion
• Collective diffusion, the diffusion of a large number of (possibly interacting) particles
• Effusion of a gas through small holes
• Electron diffusion, producing electric current
• Thermal diffusion, in the form of Heat flow
• Knudsen diffusion of particles from very small containers
• Momentum diffusion
• Osmosis
• Photon diffusion, an optical effect
  • Diffuse reflection, the reflection of light from an uneven or granular surface
• Reverse diffusion

In cultural anthropology:

• Diffusion of innovations within a culture
• Lexical diffusion within a culture
• Trans-cultural diffusion of culture items between cultures

In music:

• Diffusion (7for4 album), an album by 7for4. Diffusion is the net movement of particles (typically molecules from an area of high concentration to an area of low concentration by uncoordinated random movement This Acoustics related article is a stub. You can help Wikipedia by expanding it Atomic Diffusion is a process whereby the random thermally-activated hopping of Atoms in a Solid results in the net transport of atoms Collective diffusion is the Diffusion of a large number of particles most often within a Solvent. In chemistry effusion is the process where individual molecules flow through a hole without collisions between molecules The electron is a fundamental Subatomic particle that was identified and assigned the negative charge in 1897 by J Electric current is the flow (movement of Electric charge. The SI unit of electric current is the Ampere. In thermal physics, heat transfer is the passage of Thermal energy from a hot to a colder body Knudsen diffusion is a means of Diffusion that occurs in a long pore with a narrow diameter (2–50nm because molecules frequently collide with the pore wall Momentum diffusion refers to the Diffusion, or spread of Momentum between particles ( Atoms or Molecules of Matter, usually in the Osmosis is the Diffusion of a solvent (frequently water through a semi-permeable membrane, from a solution of low solute concentration (high water potential Photon diffusion refers to a situation where Photons travel through a material with a high Optical depth and very short Mean free path. Diffuse reflection is the reflection of Light from an uneven or granular surface such that an incident ray is seemingly reflected at a number of angles Reverse diffusion refers to a situation where the transport of particles ( Atoms or Molecules in a medium occurs towards regions of lower concentration gradients opposite Cultural anthropology is one of four fields of Anthropology (the holistic study of humanity) as it developed in the United States. According to Rogers(2003 "Diffusion is the process by which an innovation is communicated through certain channels over time among the members of a social System In Historical linguistics, lexical diffusion is both a phenomenon and a theory Cultural diffusion, as first conceptualized by Alfred L Kroeber in his influential 1940 paper Stimulus Diffusion, or trans-cultural diffusion in later reformulations Music is an Art form in which the medium is Sound organized in Time. Diffusion is the third full-length album by 7for4, released in 2008

In other areas:

• The Diffusion Science Radio Show is a science radio show on 2SER in Sydney and podcast
• Diffusion (computer graphics), the reflective intensity of a simulated surface's color
• Diffusion (business), the process by which a new idea or new product is accepted by the market
• Diffusion (cryptography), the spreading of influence of bits in a cipher
• Diffusion process, in probability theory the solution to a stochastic differential equation
• Diffusion of responsibility
• Society for the Diffusion of Useful Knowledge

2SER is a Community radio station in Sydney, New South Wales, Australia, broadcasting on the frequency 107 Sydney (ˈsɪdniː is the most populous city in Australia, with a Metropolitan area population of approximately 4 A podcast is a series of audio or Video digital-media files which is distributed over the Internet by syndicated Download Diffusion is the process by which a new Idea or new product is accepted by the Market. In Cryptography, confusion and diffusion are two properties of the operation of a secure Cipher which were identified by Claude Shannon in his In Probability theory, a branch of Mathematics, a diffusion process is a solution to a Stochastic differential equation. A stochastic differential equation (SDE is a Differential equation in which one or more of the terms is a Stochastic process, thus resulting in a solution which is Diffusion of responsibility is a Social phenomenon which tends to occur in groups of people above a certain critical size when responsibility is not explicitly assigned The Society for the Diffusion of Useful Knowledge, founded in 1826, was a Whiggish London organisation that published inexpensive texts intended to adapt

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