αL:	Thermal expansion coefficient of the reference fluid (pentadecane).
mpa:	Mass of the standards used to determine the air mass in the hydrometer, ma.
σma:	Standard deviation of the measurements to get the mass in the air.
ρmpa:	Density of mass standards used to determine ma
Dmpa:	Drift of mass standards used to determine ma
mpL:	Mass of the standards used to obtain the mass in the hydrometer's liquid, mL
ρmpL:	Mass standards density used in determine mL
DmpL:	Drift of mass standards used to determine mL
p:	Air barometic pressure during the calibration
h.r.:	Air relative humidity during the calibration