The first occurrence of a measured weight decrease greater than the reference rate signifies that {HEAD ~ the boiling point} of {TAIL ~ the liquid} has been reached 
of
The first occurrence of a measured weight decrease greater than the reference rate signifies that { HEAD ~ the boiling point } of { TAIL ~ the liquid } has been reached
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH