I have been "googling" to find the relationship between the above, and the answer has mostly been a resounding "NO". Maybe my question is not "CFM" vs "PSI", but that is the only way I know how to descibe my question. I will explain the scenario: I have air flowing at a constant speed (over the body of a car) which is being "collected" with a scoop and then channelled into a cavity with an open end, so the air flows through it. At the back of the cavity, I measure the "pressure" of the air by means of a Magnehelic meter which gives pressure in "inches of water" as the air passes over / through my measuring point back to the athmosphere. If I increase the collection area of the scoop, I get more air being collected still at the same constant speed and the pressure measured increases as more air flows through the collection point. My question is this: If the pressure as measured at the back of the cavity increases by 20%, what relationship does the "volume of air" collected by the two different scoops have to this 20% increase in velocity pressure? Is this a 1:1 relationship, or is it something different? I am trying to equate that a 20% pressure increase as measured by my meter is as a result of a x% increased in air flow.