A method 19 including determining at least one of {HEAD ~ a viscosity} and a density of {TAIL ~ the fluid} 
of
A method 19 including determining at least one of { HEAD ~ a viscosity } and a density of { TAIL ~ the fluid }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL