The chamber is sealed and {HEAD ~ a heater} causes {TAIL ~ the liquid} within the chamber to vaporize 
causes
The chamber is sealed and { HEAD ~ a heater } causes { TAIL ~ the liquid } within the chamber to vaporize
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH