The fluorocarbon vapor is more dense than {TAIL ~ the air} within the chamber and is not miscible with {HEAD ~ that air} 
The fluorocarbon vapor is more dense than { TAIL ~ the air } within the chamber and is not miscible with { HEAD ~ that air }
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD