The force is used to determine the density of the insulation, which, in {TAIL ~ turn}, is used to determine the thermal resistance or R value of {HEAD ~ the insulation} 
The force is used to determine the density of the insulation , which , in { TAIL ~ turn } , is used to determine the thermal resistance or R value of { HEAD ~ the insulation }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD