concentration gradient

noun Chemistry.
the gradual difference in concentration of a dissolved substance in a solution between a region of high density and one of lower density.
Also called density gradient.
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WordNet
concentration gradient

noun
a gradient in concentration of a solute as a function of distance through a solution; "the movement of a solute down its concentration gradient is called diffusion" 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
Once found, they follow the chemicals' concentration gradient back to their source.
If they both ran in the same direction there wouldn't be a concentration gradient.
The theory for thermoacoustic mixture separation is extended to include the effects of a nonzero concentration gradient.
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