Influencing Magnitudes And Error Sources - KERN YDB-03 Mode D'emploi

Determining density of liquids
The density of a liquid is determined with the help of a sinker providing a known
volume [ V ]. The sinker is weighed in air [ A ] as well as in the test liquid [ B ].
According to the Archimedes' Principle a body immersed in a liquid experiences a
force of buoyancy [ G ]. This force equals the weight force of the liquid displaced by
the volume of the body.
The volume [ V ] of the immersed body equals the volume of the displaced liquid.
G = buoyancy of sinker
Buoyancy of sinker =
Weight of the sinker in air [ A ] - weight of sinker in test liquid [ B ]
From this follows:
ρ = Density of test liquid
A = weight of sinker in air
B = weight of the sinkers in test liquid
V = volume of sinker

3.1 Influencing magnitudes and error sources

 Air buoyancy
 Temperature
 Surface tension of the liquid
 Adhesion of liquid on the wire
 Air bubbles
 Immersion depth of the sample dish or of the sinker
 Porosity of the solid
YDB-03-BA-e-1410
G
ρ =
V
A-B
ρ
ρ =
+
L
V
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