### process:

Diffusion
* Diffusing essential oils is what is called aromatherapy.
* Most diffusion relies on proton secretion
* Some diffusion occurs across gut walls
  - in capillaries
* allows gas exchange to occur.
* alone governs direction of gas flow.
* also occurs to some extent in both cholinergic and adrenergic receptor sites.
* always occurs down a concentration gradient.
* can occur through a cell membrane
  - tight junctions or within bulk solutions
  - only work with gases and liquids
  - take place right through the skin
  - vary with wavelength
* coefficients in metals.
* depends upon random particle movements.
* describes the transfer of material from one spatial location to another.
* geologically very important transport mechanism.
* involves the collision of gas molecules.
* is also the process by which gases move in and out of the leaf
  - of two gases mixing together, if both stored in the same container
  - always down a concentration gradient
* is an action
  - important process for signal transduction
  - associated with the dependency of the output bits on the input bits
  - based on a contagion process occuring on the occasion of random encounters
* is caused by kinetic energy , the energy of motion
  - quick leaps of penetrant molecules from one cavity to another
  - driven by concentration gradients
  - essential to living things
  - imperative for the distribution of ion and other solutes within a cell
  - important in many life processes
  - modelled by piecewise linear finite elements at each new time level
  - movement of particle from high to low concentration
  - natural processes
* is one form of passive transport
  - of the fundamental processes by which material moves
  - type of passive transport
  - passive movement down a concentration gradient
  - random movement down a concentration gradient
* is required for the neurotransmitter to reach the target cells
  - to supply all organisms with oxygen
  - simply related to the ability of a current to pass through the cluster
  - simulated by a random walk
  - slow, and rot consumes the oxygen faster than it can arrive
  - spread
* is the dominant transport mechanism for phosphorus and potassium
  - driving force behind the movement of many substances across cell membrane
  - electrical exchange of ions at a molecular level
* is the intermingling of solids, liquids, and gases due to differences in composition
  - two or more types of atoms or molecules
  - kind of heat transfer which becomes important
  - main process in metallurgy and crystal growth
  - most important mechanism for deposition in the small airways and alveoli
* is the movement of materials from a higher concentration to a lower concentration
  - a higher to a lower concentration
  - molecules through the soil
  - particles from a high density region to a low density region
  - point defects through the lattice
  - moving of particles from areas of high concentration to areas of low concentration
  - net movement down the concentration gradient
  - osmosis of water
  - physical processes by which they come into contact with one another
* is the process by which ions move from an area of higher to lower concentration
  - liquid metals mix without stirring
  - the adoption of an innovation spreads
  - used by mechanical aerators
  - random molecular motion of molecules or atoms due to their kinetic energy
  - reason photographers like to shoot under an overcast sky
* is the result of collisions between molecules
  - thermal motion
* is the spread of an innovation among a group
  - ideas to other areas
  - transfer of materials across or through the cell membrane
  - way water moves out of the saltwater fish and into the ocean
* is when particles move from a high concentrated area to a low concentrated area
  - traditions move across boundaries
  - where elements move from an area of high concentration to an area of low concentration
* kind of migration of molecules from areas of high density to areas of low density.
* means moving from one area to another.
* moves oxygen across respiratory surfaces
  - the molecules from the more concentrated side to less concentrated side
* occurs as a random selection of a particular path through the mountain passes
  - based on differences in concentration
  - because of the natural random movement of molecules
  - between the capillaries of the two blood supplies
  - even after equilibrium is reached and no net change is apparent
  - from a region of higher concentration to a region of lower concentration
  - in the human body, too
* often masks gravitational effects.
* only works in a very small organism.
* partly determines the rate of transport.
* passive process driven by random movement of molecules
  - type of transport, it requires no additional energy to make it work
* physical fact.
* plays an important role in the movement of materials, but it very slow process.
* reduces concentration.
* represents a minimal loss rate from a reservoir.
* requires exposing water to the air.
* result of the kinetic energy of atoms and molecules.
* selective process.
* slow and weak force
  - process, moving chemical molecules only very short distances
* special case of passive movement in a chemical field.
* starts on Earth, as soon as the chambers are filled.
* takes place more slowly in water because water is denser than air.
* tends to distribute particles uniformly throughout the available volume.
* thermally activated process.
* usually happens in a gas although it can happen in a liquid.
+ Confusion and diffusion: Math stubs :: Cryptography
  * This happens through otherwise random movement. Diffusion usually happens in a gas although it can happen in a liquid. It is possible to see diffusion happening when two liquids are mixed in a transparent container.
  * It describes the constant movement of particles in all liquids and gases. These particles move in all directions bumping into each other. Diffusion can only work with gases and liquids.