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In a lot of medical literature about blood flow in the brain, researchers denote the amount of volumetric blood flow that passes through a certain amount of brain tissue as "cerebral blood flow". However, its associated unit is volumetric flow per unit of mass, e.g. 50 mililiters per minute per 100 grams of brain tissue.

However, I don't want to mix up actual volumetric flow (e.g. in mililiters per minute) with this volumetric flow per mass. Can you suggest a name for the latter quantity?

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The word "specific" (as in specific gravity or specific heat capacity) means per unit mass, so you could call it "specific flow" or "specific volumetric flow".

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