User manual

ALT-A02/PLT-A01-BA-e-1310 5
ρ =
A
A-B
o
ρ
ρ =
m
V
2 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
ABS/ABJ balances provides fast and safe determination of solids and liquids. 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
o
] the density of the solid [ ρ ] is calculated as
follows:
ρ = Density of sample
A = Weight of the sample in air
B = Weight of the sample in the aid liquid
ρ
o
= Density of the aid liquid
1
g
cm
3
1
kg
m
3
1
g
l