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this is for practicality and it's a bad habit in scientific researchers that has been propagated across subfields. the ideal format would be concentration and volume.Interesting that you are using 50mg in 4-5ml of vehicle (1-1.25% concentration).
I have always thought that the amount of the active ingredient that you apply is what matters not the concentration but everywhere you read says it's concentration; although in saying that there is such limited information online, which is staggering, really.
I think of it as if you had a donut (vehicle) with an area of 200cm2 which contained 50 grams of sugar (active) and a donut with an area of 600cm2 which also contained 50 grams of sugar, you're still getting the same amount of active ingredient (sugar) through your body, despite the vehicle being 3 times larger in the second instance, but it doesn't seem to be the accepted school of thought; despite my experiences being to the contrary.
volume is also important because solubility oftens defines proper delivery.
concentration allows you to make comparisons with other studies/study subgroups.