As mentioned above, {TAIL ~ the resistance} varies with {HEAD ~ flow}, but it does not vary significantly with pressure 
As mentioned above , { TAIL ~ the resistance } varies with { HEAD ~ flow } , but it does not vary significantly with pressure
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH