The fluid assembly discharges the fluid to fill the cavity from a first position to a second position, the second position having an amount of {TAIL ~ a final volume} such that {HEAD ~ a difference} between the known initial volume amount and the final volume amount of the second position equals the volume of the body 
The fluid assembly discharges the fluid to fill the cavity from a first position to a second position , the second position having an amount of { TAIL ~ a final volume } such that { HEAD ~ a difference } between the known initial volume amount and the final volume amount of the second position equals the volume of the body
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH