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3 Principle of Density Determination
Three physical magnitudes are the volume and the mass of bodies as well as the
density of matter. In density mass and volume are related.
Density [ ρ ] is the relation of mass [ m ] to volume [ V ].
SI-unit of density is kilogram divided by cubic meter (kg/m³). 1 kg/m³ equals the
density of a homogenous body that, for a mass of 1 kg, has the volume of 1 m³.
Additional frequently applied units include:
The application of this density determination set in combination with the KERN
analytical balances provides fast and safe density determination of solids and fluids.
Our set uses the "Principle of Archimedes" to determine density:
BUOYANCY IS A FORCE. IT AFFECTS A BODY THAT IS IMMERSED INTO A LIQUID. THE
BUOYANCY OF THE BODY EQUALS THE WEIGHT FORCE OF THE DISPLACED LIQUID. THE
FORCE OF BUOYANCY ACTS VERTICALLY UPWARDS.
Thus, density is calculated according to the formulae below:
To determine the density of solid matter
Our balances enable weighing of solids in air [ A ] as well as water [ B ]. If the density
of the buoyancy medium is known [ ρ
follows:
ρ = Density of sample
A = Weight of the sample in air
B = Weight of the sample in the aid liquid
ρ
= Density of the aid liquid
o
The air buoyancy is not considered in the formula.
YDB-03-BA-e-2114
m
ρ =
V
g
1
3
cm
] the density of the solid [ ρ ] is calculated as
o
A
ρ =
ρ
o
A-B
kg
g
1
1
3
m
l
,
,
11
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