What is signifying by concentration gradient, Biology

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Q What is signifying by concentration gradient? Is it correct or not to refer to "concentration gradient of water"?

Concentration gradient is the variation of concentration of a substance between two regions.

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


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