AND GR Series Manuale di istruzioni - Pagina 6

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DENSITY MEASUREMENT PRINCIPLES

3.

3.1. Density

Density refers to the total mass of a sample per unit volume.
M
ρ
=
V

3.2. Specific Gravity

Specific gravity refers to the ratio of the density of a sample to the density of pure water at 4°C under a
pressure of 1013.25 hPa.
M
ρ =
V

3.3. Archimedes' Principle of Density Measurement

The AD-1653 is combined with an electronic balance to measure the density of a sample based on the
Arichimedes' principle.
Arichimedes' principle
A body immersed in a liquid (or a gas) is subject to an upward force equal to
the weight of the liquid (or the gas) it displaces. The upward force is buoyancy.
(Unit: g/cm
ρ
: Density
M : Mass
V : Volume
(No unit)
ρ
4
ρ
: Specific gravity
M : Mass
V : Volume
ρ
: Density of water at 4°C
4
(0.99997 g/cm
3
, etc.)
≈
3
3
1.000 g/cm
)
4