For a given source pressure, the loose fill insulation has {TAIL ~ a characteristic pressure drop} for {HEAD ~ a given density} 
For a given source pressure , the loose fill insulation has { TAIL ~ a characteristic pressure drop } for { HEAD ~ a given density }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD