Consequently, as the fluorocarbon vaporizes, {HEAD ~ the air} within the chamber is displaced through {TAIL ~ a vent} in the top of the chamber 
Consequently , as the fluorocarbon vaporizes , { HEAD ~ the air } within the chamber is displaced through { TAIL ~ a vent } in the top of the chamber
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH