Diffusion

thumb|right| Some particles are Dissolution (chemistry)|dissolved in a glass of water. At first, the particles are all near one top corner of the glass. If the particles randomly move around ("diffuse") in the water, they eventually become distributed randomly and uniformly from an area of high concentration to an area of low, and organized (diffusion continues, but with no net [[flux).]] thumb|Time lapse video of diffusion a dye dissolved in water into a gel.

thumb|400px|right|The process of osmosis over a semipermeable membrane. The blue dots represent particles driving the osmotic gradient. Osmosis (, ) is the spontaneous net movement of solvent molecules through a selectively permeable membrane from a region of high water potential (region of lower solute concentration) to a region of low water potential (region of higher solute concentration), in the direction that tends to equalize the solute concentrations on the two sides. It may also be used to describe a physical process in which any solvent moves across a selectively permeable membrane (p

membrane which will allow certain molecules or ions to pass through it by diffusion

partial differential equation for distribution of heat in a given region over time

theory

mathematical descriptions of molecular diffusion

thumb|250px|The image on the left shows effusion, whereas the image on the right shows Molecular diffusion|diffusion. Effusion occurs through an orifice smaller than the mean free path of the particles in motion, whereas diffusion occurs through an opening in which multiple particles can flow through simultaneously.|alt=

biological process

proportionality constant in some physical laws

graphical presentation of the maturity of specific technologies

equation that describes density changes of a material that is diffusing in a medium

model

combination of the diffusion and convection (advection) equations

early customer of a company, product, or technology

Osmolytes are low-molecular-weight organic compounds that influence the properties of biological fluids. Osmolytes are a class of organic molecules that play a significant role in regulating osmotic pressure and maintaining cellular homeostasis in various organisms, particularly in response to environmental stressors. Their primary role is to maintain the integrity of cells by affecting the viscosity, melting point, and ionic strength of the aqueous solution. When a cell swells due to external osmotic pressure, membrane channels open and allow efflux of osmolytes carrying water, restoring norm

Self-diffusion describes the diffusive motions of molecules within themselves e.g. the movement of a water molecule in water. According to the IUPAC definition, the self-diffusion coefficient D_i^* of medium i is the diffusion coefficient D_i of a chemical species in said medium when the concentration of this species is extrapolated to zero concentration. It can be described by the equation:

annular figures or bands formed by chemical precipitation

sociological model that describes the adoption or acceptance of a new product or innovation

equation used to calculate the electromigration of ions in a fluid

water purification process

stages of research and development, ascent, maturity, and decline of new technological innovations

thermal motion of liquid or gas particles at temperatures above absolute zero

Changes of oxygen partial pressure in the pulmonary alveoli caused by a soluble anesthetic gas

model for describing diffusion

net transport of atoms through a solid

Mechanics concept

phenomenon in chemistry involving solutions of electrolytes

Model of diffusion

physical phenomenon