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