Substitution Method for Liquid Density Measurements
Substitution Method for Liquid Density Measurements
Salvatore Lorefice, Istituto Nazionale di Ricerca Metrologia, and Raffaella Romeo, Politecnico di Torino DISAT
The improvement of modern oscillation-type density meters requires density reference liquids with low uncertainty and very accurate procedures that take into account the physical properties of the fluids. INRIM adopted a procedure concerning the substitution method in determining the densities by vibrating tube densimeter of deuterated water, n-pentadecane and the oil EF 170 having a viscosity of approximately 170 mm²/s, liquids provided by the pilot laboratory BEV as transfer standards in the EURAMET project 1240. In the present paper are shown as an example about the validity of the used procedure through the results of the density determinations at 20 °C of the deuterated water and of the viscous oil, being the differences of the physical properties of the two liquids significant enough
20.00