Hi all, Recently did a lab experiment where we had a nozzle pointing vertically upwards at a flat plate normal to the direction of the flow of air. The plate had a spring gauge on it so that the force of the air on the plate could be measured. The plate was moved to various distances above the air nozzle and it was found that the force remained constant with distance from the nozzle. However, at very small distances, the force on the plate reduced dramatically. My question is: Why would the force on the plate remain constant with distance from the nozzle apart from at very small distances? Thanks.