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