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. 2017 Feb 17;12(2):e0172421. doi: 10.1371/journal.pone.0172421

Fig 4. Dimensional representation of the pressure drop–flow relationship.

Fig 4

We measured pressure drops for each tube, while compressed air was constantly delivered at a specific flow rate. There was a nearly linear relationship between pressure drop and flow when the flow rate was less than 0.5 L/s.