Random movement of molecules or other particles, resulting in even distribution of the particles when no barriers are present.
the process whereby dissolved particles (ions and molecules) distribute themselves equally within a given space; the particles move from an area of higher concentration to an area of lower concentration until equilibrium is reached.
random movement of molecules, resulting in a movement of those molecules from an area of high concentration to an area of low concentration.
The transport or natural drift of molecules traveling from an area of higher concentration to an area of lower concentration. Diffusion does not require outside energy from the cell.
The process where molecules spread out to form an even concentration.
Motion of carriers caused by thermal energy
(dif·FU·sion). The spread of cultural traits from one sociocultural system to another.
The spontaneous act (requiring no energy input) of substances moving from an area of higher concentration to an area of lower concentration.
The physical process in which a substance moves from areas of higher concentration or pressure to lower concentration or pressure.
The gradual mixing of the molecules of 2 or more substances by random molecular motion.
the net movement of substances from an area of higher concentration to an area of lower concentration.
One of three processes by which soil nutrients become available to African Violets and other plants. As nutrients are absorbed, a lower concentration is formed at the root interface. To even out the concentration throughout the soil, nutrients move from areas of higher concentration to areas of lower concentration around the roots. Also see Mass Flow and Root Interception.
the random movement of molecules that tends to distribute molecules uniformly, from regions of higher to lower concentration.
The random scattering of sound waves. A convex surface acts as a diffusor.
diffuse. Compare with effusion. The mixing of two substances caused by random molecular motions. Gases diffuse very quickly; liquids diffuse much more slowly, and solids diffuse at very slow (but often measurable) rates. Molecular collisions make diffusion slower in liquids and solids.
Passive molecular movement from an area of higher concentration to an area of lower concentration.
A gas has no definite shape or volume, and outside of a container, a gas will spread or diffuse. Energetic gas molecules randomly scatter with other molecules and travel a nearly random path. You can experiment with diffusion by using odors such as perfume, and measure how long it takes molecules of perfume to travel to a distant nose. Will it take less time in a cold room or a hot room
The movement of a material, such as a gas or liquid, in the body of a plastic. If the gas or liquid is absorbed on one side of a piece of plastic and given off on the other side, the phenomenon is called permeability. Diffusion and permeability are not due to holes or pores in the plastic but are caused and controlled by chemical mechanisms.
The net movement of units of a substance from areas of higher concentration to areas of lower concentration of that substance
The movement of molecules or ions from areas of their higher concentration to areas of their lower concentration. Over time, the random movement of molecules will result in the even distribution of the material.
The spontaneous and even mixing of gases or liquids.
Migration of atoms, molecules or ions spontaneously, under the driving force of compositional differences, and using only the energy of thermal excitation to cause atom movements.
the movement of molecules through a membrane from a region of high concentration to low concentration.
(1) Of ions. The spontaneous migration of ions from a more concentrated solution into a more dilute solution. Compare osmosis.(2) Of thermal neutrons. A net movement or flow of thermal neutrons from regions of higher neutron concentration to regions of lower concentrations. The neutrons are moving with velocities corresponding to their energies in more or less random directions (due to repeated scattering interactions). Thus, there is a tendency for more neutrons to leave the higher-concentration zone and for fewer to enter it. An example case is when the neutron population in the borehole is much lower than that in the formation because the neutrons are rapidly captured by the abundant chlorine nuclei in the very saline borehole fluid. More neutrons will diffuse from formation to borehole than from borehole to formation, and there will be a net flow of neutrons from formation to borehole. There is generally a net diffusion flow away from the source (i.e., toward zones of lower neutron concentration) and a tendency for net flow from a zone of smaller capture cross section to one of larger capture cross section.
The process of spontaneous intermixing of different substances due to molecular motion which tends to produce uniformity of concentration.
The random movement of molecules within a fluid.
Passage of particles from a solution of high concentration to a solution of low concentration.
Motion of particles caused by thermal energy
the process by which two fluids or solutions disperse and mix when put together in a single area because of random movement of molecules by intermolecular collision.
the process by which molecules move from a region of high concentration to one of lower concentration, as in the exchange of oxygen and carbon dioxide in the lungs.
the process by which molecules move through their kinetic energy from an area of higher concentration to an area of lower concentration.
(Latin, diffundere = to pour out) Random movements that lead to a uniform distribution of molecules both within a solution and on the two sides of a membrane.
Net drift of molecules in the direction of lower concentration due to random thermal movement.
The movement of a chemical from a high concentration area to a low concentration area. Eventually, an equilibrium is reached where chemical is in equal concentrations throughout the system.
The movement of water vapor from regions of high relative humidity (RH) toward regions of lower RH driven by a higher to lower temperature differential.
(physics) the process of diffusing; the intermingling of molecules in gases and liquids as a result of random thermal agitation
when particles move from an area of high to lower concentration
The spontaneous movement of particles from an area of higher concentration to an area of lower concentration. PICTURE
Mass transfer process in which compounds are mixed as a result of the random movement of their elements (atoms, molecules or ions).
The movement of suspended or dissolved particles from an area of higher concentration to an area of lower concentration as the result of random movement of individual particles.
The spontaneous tendency of a substance to move down its concentration gradient from a more concentrated to a less concentrated area.
The process whereby particles of liquids, gasses, or solids intermingle due to movement from a region of higher concentration to a region of lower concentration. For example, if a drop of sugar is dropped into a glass of pure water, at first the sugar will mostly be concentrated where the drop first enters the water. Over time, however, the sugar will "diffuse" throughout the glass of water.
The movement of species under the influence of a concentration gradient.
the random movement of particles (gases, ions etc...)
The phenomenon of movement of matter at the atomic level from regions of high concentration to regions of low concentration. A thermal process by which minute amounts of impurities are deliberately impregnated and distributed into semiconductor material.
A process by which the molecules of two or more substances gradually mix as a result of random thermal motion.
Diffusion is the spontaneous movement of liquid, gas, or solid particles from an area of high concentration to low concentration. For example, uncapping a bottle of essential oil produces diffusion as the volatile constituents move from the bottle (an area of high concentration) into the environment (an area of low concentration) without being acted upon by heat or pressure. This could also be referred as spontaneous evaporation. Technically, all of the apparatuses used in aromatherapy vaporize or volatilize essential oils because they are acted upon by heat, and/or pressure, to produce fine separated particles or vapor.
The spontaneous mixing of one substance with another, as for example, the movement of gas molecules to the nose and respiratory track or the spread of liquid contaminants through a sediment bed.
The name of a standard thermal procedure used in the manufacture of semiconductor chips wherein minute amounts of dopants are introduced into a substrate material by heating the wafers in a furnace from 400ºC – 1150ºC in an atmosphere of dopant atoms.
When particles mix with each other without anything moving them.
The movement of electrical charge carriers or particles from regions of high concentration to regions of lower concentration. In semiconductor fabrication, the movement of impurity atoms during high temperature annealing.
the way in which freely moving particles in liquids and gases spread out to fill all the space available to them.
the random movement of molecules due to their kinetic energy. It increases with increased temperature.
Diffusion is when the atoms or molecules of a gas or liquid move from a region of higher density to one of lower density as a result of their random motion. States of Matter
The movement of water vapor through a material. Diffusion depends on vapor pressure, temperature, relative humidity, and the permeability of a material.
the random movement of atoms, ions or molecules through a solid, liquid or gas.
Pertaining to movement of acid within the pores of plates. (See Equalization.)
A method of doping or modifying the characteristics of semiconductor material by "baking" wafers of the base semiconductor material in furnaces with controlled atmospheres of impurity materials.
describes motion of individual entities, most frequently of single molecules, in a field. The latter is often caused by molecular concentration gradient, but can also stem from an electrical potential gradient (electro-diffusion), from thermal gradient (thermo-diffusion), etc..
The scattering or random reflection of a sound wave from a surface. The directions of reflected sound is changed so that listeners may have sensation of sound coming from all directions at equal levels.
intermingling of essential oil molecules into the air
A process where heat or chemicals are transported in response to differences in chemical concentration or temperature. Movement is from high concentration (or temperature) to low concentration (or temperature). This process could involve liquids, gases or solids.
spontaneous mixing of particles of two substances caused by random motion
Passage of particles from an area of high concentration to a solution of low concentration resulting in an even distribution of particles.
the movement and spreading out of a substance, such as the movement of gases between aquatic leaves and the water; radiation scattered and reflected by water vapor, clouds, and other atmosphere gases.
The net movement of molecules from a region of higher concentration to a region of lower concentration. May also be defined as the movement from a region of higher kinetic energy to a region of lower kinetic energy.
The movement of water vapor from an area of higher concentration to an area of lower concentration. A material that allows for easy water vapor diffusion is considered permeable.
mass transport by atomic motion.
The movement of molecules away from the center of concentration of a substance.
The natural movement of particles from a region of higher concentration to a lower concentration; in WILSIM, diffusion simulates the movement of eroded particles from high elevations to lower elevations down a developing slope
(DLCO) The movement of oxygen or carbon dioxide across the membrane of the alveoli to the blood.
The process where molecules in liquid or gas move under the influence of kinetic energy along the direction of their concentration gradient. Diffusion is a special case of dispersion.
In cake washing, removing the original liquor around the individual particles by mixing with the wash liquor.
The movement of a substance from an area of high concentration to an area of lesser concentration as a result of random movement.
Thermally activated random (Brownian) motion of molecules in a fluid. Diffusion in a gradient magnetic field causes a reduction in the apparent T2 measured by the CPMG process
In audio, the scattering or dispersion of sound waves.
concentration dependant migration of colloidal particles, molecules or ions, mainly caused by random thermal movement
The outward spreading of a plume of liquid or gas from areas of greater concentration to areas of lesser concentration.
Movement from a high concentration to a low concentration across a membrane. Diffusion of some molecules occurs across the lipid bilayer and diffusion of other molecules occurs with the help of a special protein. Diffusion does not need energy from the cell.
the process by which molecules or other particles intermingle and migrate due to their random thermal motion. NMR provides a sensitive technique for measuring diffusion of some substances.
Diffusion is the spontaneous mixing of one substance with another when in contact or separated by a permeable membrane. Diffusion is a result of the random motions of their component atoms, molecules, ions, or other particles. Diffusion occurs most readily in gases, less so in liquids, and least in solids. The rate of diffusion is proportional to the concentration of the substance and increases with temperature. The theoretical principles are stated in Fick's laws.
An acoustic term that refers to sound striking a surface and scattering in many directions.
(1) The intermingling or mixing of the molecules of two or more substances. (2) The process by which both ionic and molecular species dissolved in water move from areas of higher concentration to areas of lower concentration.
The spreading of ions into a fluid or porous medium in a direction tending to equalize concentrations in all parts of the system; it is understood to occur in the absence of fluid convection and as a result of the thermal kinetic energy of the particles.
(l) Spreading of a constituent in a gas, liquid, or solid, tending to make the composition of all parts uniform. (2) The spontaneous movement of atoms or molecules to new sites within a material.
The movement of gas or liquid particles or molecules in a body of fluid through or into a medium and away from the main body of fluid.
Particles in a fluid (a liquid or gas), slowly spread as they are bumped into by other particles around them.
The movement of individual molecules through a material. The movement occurs because of concentration gradients and thermal gradients, independent of airflow.
The net movement of particles from a region of high concentration to an area of lower concentration, bought about by the kinetic energy of the particles.
Process by which particles of liquids, gases or solids spread from regions of higher concentration to regions of lesser concentration as a result of random molecular movement.
The movement of individual species of gas in response to a concentration gradient.
Semiconductor manufacturing process that infuses tiny quantities of impurities into a base material, such as silicon, to change its electrical characteristics.
(1) the movement or atoms or molecules to new sites within a material. (2) Spreading of a constituent in a gas, liquid or solid, tending to make the composition of all parts uniform.
The random movement of atoms, molecules or ions due to thermal excitation. Can occur in gases and solutions.
The movement of a substance such as water vapor from regions of high concentration to regions of lower concentration
a process by which substances, heat, or other properties of a medium are transferred from regions of higher concentrations to regions of lower concentration.
Filter collection mechanism that occurs when the random (Brownian) motion of a particle causes that particle to contact a fiber. See also Inertial Impaction, Interception, and Electrostatic Attraction.
The process of particles moving from an area of higher concentration to one of lower concentration.
In an atmosphere, as in any gaseous system, the exchange of fluid parcels between regions, in apparently random motions of a scale too small to be treated by the equations of motion.
The standard procedure for doping silicon by heating wafers in a furnace from 400 to 1,150 degrees C in an atmosphere of dopant atoms.
Scattering light over a large solid angle. Light is diffused by reflecting from or transmitting through an irregular (rough) surface. For example, a ground or frosted surface acts as a good diffuser, as well as a filter or screen. There are different types of diffusers, differing mainly by how they scatter light and how evenly (or by what angle) they diffuse light.
The process by which molecules in a single phase equilibrate to a zero concentration gradient by random molecular motion Brownian motion. The flux of molecules is from regions of high concentration to low concentration and is governed by Ficks Second Law.
Blending of a gas and air, resulting in a homogeneous mixture. Blending of two or more gases.
A semiconductor manufacturing process in which desired impurities are introduced into the silicon by baking the silicon wafers at high temperatures and pressures in chemically altered atmospheres. A less precise alternative to ion implantation.
Diffusion is the movement of a chemical, usually under a pressure differential. In fuel cells, diffusion may happen through a palladium membrane to purify hydrogen or through the fuel cell electrodes before splitting of a hydrogen molecule.
Movement of internal liquid or vapor from the interior of a solid to the surface
Diffusion generally refers to the spreading out or dispersing of a material. Chemical diffusion is a passive process in which there is a net or greater movement of molecules or ions from a region of high concentration to a region of low concentration until equilibrium is reached.
the slow movement of an ion in water mostly by its own kinetic motion.
The random distribution of gray tones in an area of an image.
Intermixing of atoms and/or molecules in solids, liquids, and gases due to a difference in composition.
the movement of water vapor from regions of high concentration (high water vapor pressure) toward regions of lower concentration (due to random thermal molecular motion).
Diffuusio Diffusion Diffusion in impregnation of wood chips: movement of ions and molecules from an area of high concentration (e.g. the free cooking liquor surrounding the chips) to an area of lower concentration (e.g. the inner part of the chips).
purification mechanism linked to the transfer of substances from spaces of higher concentrated to areas of lower concentration.
a passive form of random movement in which areas of high chemical concentration gradually spread throughout an entire system, equalizing the chemical concentration over the system. For example, the exchange of gases in the lungs occurs by simple diffusion across capillary walls.
The spreading of a constituent because of the natural tendency to achieve advanced uniformity of composition in all the parts of a gas, liquid or solid.
Driving force for compensating differences in concentration in the electrolyte.
A process by which a substance moves from a region of high concentration to a region of low concentration solely due to the thermal energy possessed by the molecules.
process in which molecules move from an area of higher concentration to one of lower concentration
process by which gases intermingle as the result of their spontaneous movement caused by thermal agitation.
This term refers to process of movement of particles in gases, liquids or solutions from where they are more concentrated, to where they are less concentrated.
The passive movement of a substance from a region where it is more concentrated to a region where it is less concentrated. For example, blood alcohol concentration decreases as alcohol diffuses from the blood into body tissues.
The movement of suspended or dissolved particles from a more concentrated to a less concentrated region as a result of the random movement of individual particles; the process tends to distribute them uniformly throughout the available volume.
Diffusion is the effect that the random movement of molecules have that causes the movement of molecules from a region of high concentration to low concentration. Diffusion will stop (that is the change in the relative levels of concentration) when the concentration of the substance in solution is equal at all points.
Takes place on particles so small that their direction and velocity are influenced by molecular collisions. These particles do not follow the air stream, but behave more like gases than particulate. They move across the direction of air flow in a random fashion. When a particle does strike a fiber, it is retained by the van der Waals forces existing between the particle and the fiber.
a process whereby a substance redistributes from an area of relatively high concentration to an area of relatively low concentration due to random thermal motion. The larger the concentration gradient the faster diffusion occurs for a given temperature, conversely, the higher the temperature the faster diffusion occurs for a given concentration gradient.
The flow of molecules, usually, but not necessarily, through a membrane.
1. Scattering of light rays as by reflection; the softening of light as by use of frosted glass. 2. Intermingling of the molecules of liquids or gases. 3. Dispersing or spreading out.
The movement of atoms or molecules from one part of a medium to another caused by their random thermal motion. The result of diffusion is a tendency for particles to move from an area of higher concentration to an area of lower concentration.
The movement of molecules from a region of high concentration to a region of low concentration (driven by heat).
1. The transport of matter solely by the random motions of individual molecules not moving together in coherent groups. Diffusion is a consequence of concentration gradients. 2. The process of mixing fluid properties by molecular and turbulent motions. The process in turbulent flow is called turbulent or eddy diffusion. Diffusion by turbulence is much more rapid than diffusion by molecular motions. Turbulence with statistics independent of direction is called isotropic. In general, turbulence in the atmosphere and ocean is not isotropic. See diffusivity.
The movement of suspended or dissolved particles (or molecules) from a more concentrated to a less concentrated area. The process tends to distribute the particles or molecules more uniformly.
Movements of atoms within a solution. Net movement is usually from regions of high concentration to regions of low concentration to achieve homogeneity of the solution which may be a solid, gas, or liquid.
A thermal process used in semiconductor manufacturing that introduces tiny amounts of chemical impurities into the semiconductor material to achieve a desired electrical characteristic in the device.
The scattering, spreading or redirection of light in an even manner, by a lens, to achieve some intended effect such as reduced glare.
The movement of individual molecules through a material; permeation of water vapor through a material.