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1kg single-crystal silicon spheres are presently used as primary density standards in many countries. The absolute density of the spheres is determined from the measurements of their mass and volume in conformity with the definitions of the SI base units. Since the mass of the spheres is almost 1kg, a mass comparison with the prototype of the kilogram can be performed with very low uncertainty. Absolute...
Density measurements by a glass pycnometer for a light weight oil are presented as a function of temperature. Details of the measurement technique are described. An uncertainty analysis of the data was performed per the ISO Uncertainty Guide. Oil density at 20 o C was 815.077+/-0.065 kg/m 3 (+/-80 ppm) with a linear curve fit and 815.087+/-0.027 kg/m 3 (+/-33 ppm) with a cubic...
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