A&D GX-13, Инструкция по эксплуатации

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2. Principle of Density Measurement
Density
Density refers to the total amount of mass of a sample per unit volume.
(Unit: g/cm
3
, etc.)
: Density
M : Mass
V : Volume
Specific Gravity
Specific gravity refers to the ratio of the density of a sample to the density of pure water
(with the same volume as that of the sample) at 4
o
C at 1013.25 hPa.
(No unit)
S : Specific gravity
M : Mass
V : Volume
: Density of water at 4
o
C (0.99997 g/cm
3
≅
1.000 g/cm
3
)
Archimedes’ Principle of Density Measurement
Archimedes’ Principle
A body immersed in a liquid is subject to an upward force equal to the weight of the liquid it
displaces. The upward force is buoyancy.
The GX-13 is combined with an electronic balance to measure the density of a sample,
based on the Archimedes’ principle.