Principle Of Density Determination - Mettler Toledo 33360 Mode D'emploi

Density determination kit
to determine the density of solids and liquids with top-loading electronic METTLER TOLEDO balances with pan
diameters of 80 and 130 mm.
- for the density determination of solids, density determination kit 33360.
- for the density determination of liquids, density determination kit 33360
+ displacement body 210260.
1. Definition of density
- to determine the density of solids and liquids with top-loading electronic METTLER TOLEDO balances with
pan diameters of 80 and 130 mm.
The density ρ of an homogeneous body is the relationship of its mass (m) to its volume (V) or its mass per unit
of volume.
m
ρ =
V
According to DIN (German Engineering Standards) 1305, the term "Weight" can be used instead of "Mass" (m).

2. Principle of density determination

According to the Archimedean Principle, a solid body immersed in a liquid apparently loses as much of its own
weight as the weight of the liquid it has displaced. This makes it possible to determine the unknown value.
Depending on whether the body in question is liquid or solid, a slightly different procedure is involved.
The density of a liquid is determined by using a sinker of known volume. To this end, the sinker is first weighed
while in air, and then while immersed. From these two weighings (made in grams), density ρ
calculated as follows:
A - B
s s
=
ρ
1
V
s
or simply
P
s
=
ρ
1
V
s
The density of a solid body is determined by using a liquid of known density. To this end, the solid body is first
weighed in air and then immersed. From these two weighings (made in grams or in carats), density ρ
as follows:
A
=
ρ
2
A - B
or simply
A
=
ρ
2
P
The air buoyancy of a solid body is not always taken into account. If necessary, result ρ
+ 0.001 g/ cm similar to what was done in the first case; see also Section 3.2, Air Buoyancy.
3
METTLER TOLEDO 33360 + 210260
[g]
[cm ]
3
+ L
s
+ L
s
• ρ
o
• ρ
o
= Density
ρ
m = Mass
V = Volume
= Density of liquid to be tested at a given
ρ
1
temperature T
A = Weight of sinker in air
s
B = Weight of sinker when immersed in liquid
s
V = Volume of sinker
s
L = Air buoyancy per ml of sinker (correction of A
s
P ): about + 0,001 g/ ml; see also Section 3.2,
s
Air Buoyancy
P = Buoyancy of sinker in liquid
s
(instead of A
s
METTLER TOLEDO electronic balances; see
Section 4.1
= Density of solid body
ρ
2
A = Weight of solid body in air
B = Weight of solid body when immersed in test liquid
= Density of test liquid at a given temperature T
ρ
o
P = Buoyancy of solid body in test liquid (instead of
A - B): can be read directly on METTLER TOLEDO
electronic balances; see Section 4.2
of the liquid is
1
- B ): can be read directly on
s
is calculated
2
can be corrected by about
2
or
s
3