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