6.2.5 Glass Plummet for Measuring Fluids
To save test fluids used for density determination of fluids, use a small glass beaker
and an accordingly sized glass plummet. However, it needs to be pointed that a large
glass plummet achieves higher accuracy.
It is desirable that the buoyancy and the volume of the glass plummet are determined
as accurately as possible. For the determination of fluid density these results are
applied to the common denominator as well as the numerator of the formula.
6.3
General information
6.3.1 Density / Relative Density
Relative density follows from the weight of a specimen divided by the weight of water
(at 4° Celsius) of the same volume. For this reason relative density does not have a
unit. Density equals mass divided by volume.
The application of the relative density instead of the density of a fluid in a formula
produces an incorrect result. In the case of fluids only their density is
physically meaningful.
6.3.2 Drift of Balance Display
The drifting of a balance does not influence the final result of the density
determination although the shown weight of weighing in air is affected. Accurate
values are merely required if the density of fluids is determined by means of a glass
plummet.
For this purpose some of the models carry out auto-adjustment.
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ABT-A01-BA-defsi-0710
