User manual

18 ABS-A02-BA-e-1010
6.2.5 Glass Sinker for Measuring Fluids
To save test fluids used for density determination of fluids, use a small glass beaker
and an accordingly sized glass sinker. However, it needs to be pointed that a large
glass sinker achieves higher accuracy.
It is desirable that the buoyancy and the volume of the glass sinker 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 sample 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
sinker.
When changing the ambient temperature or location, an adjustment of the balance is
necessary. For this purpose remove the density set and carry out adjustment using
the standard weighing tray (see operating instructions supplied with the balance.
.