What is meant by concentration gradient, Biology

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What is meant by concentration gradient? Is it correct to refer to "concentration gradient of water"?

Concentration gradient is the difference of concentration of a substance among two regions.

Concentration is a term used to designate the quantity of a solute divided by the total quantity of the solution. As water in general is the solvent in this situation it is not correct to refer to "concentration of water" in a given solution.

 


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