Diffusion

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  Introduction:
     Diffusion can be defined as the movement of particles from a region of high concentration to a
region of low concentration across a concentration gradient. So therefore diffusion is the process 
in which a gas or a substance that is in a liquid expands to fill all the volume equally. 
 

File:Http://upload.wikimedia.org/wikipedia/commons/thumb/1/12/Diffusion.svg/410px-Diffusion.svg.png

  Cause of movement:
The reason by which the expansion of the gas or the substance in the liquid is due to the motion of its 
particles. The particles of a substance dissolved in a solvent whether they are molecules or even just 
an atom are in a continuous random movement. A given particle in the dissolved substance is equally likely 
to move out of the area or also into the area in which there is a high concentration of the particle 
present. Due to the higher number of particles in the area of the high concentration, the total 
number of particles moving towards the lower concentration is greater than the total number of 
particles moving towards the area with the higher concentration. This is called a 'net flux' of solute
particles from areas of high to areas of low concentration.  

File:Http://commons.wikimedia.org/wiki/Category:Diffusion

 Diffusion in physics
  'Ficks Law' in physics is used in physics to describe diffusion and is used to find the diffusion 
coefficient. This law also suggests that a particle will move from an area of high concentration to 
an area of low concentration across a concentration gradient. 

File:Http://upload.wikimedia.org/math/f/5/b/f5b7bf8f1da6d8184514659ee8ba07b1.png

Refrences