64
Equations Used to Determine Density:
Buoyancy: Rho = (Wa + (Rhofl – LA)) ÷ ((Wa – Wfl) + Corr) + LA
For the buoyancy method, a factor of 0.99983 (factory
setting) is used to allow for the buoyancy caused by the bars
of the sample holder of the YDK 01 (LP) Density Determination Kit. This
factor is yielded by allowing for this equation:
buoyancy of bars = 2 + d
2
÷ D
2
(Wa – Wfl)
The equation takes the following variables into consideration: the number
of wires or bars, the wire/bar diameter of the sample holder, and the inner
diameter of the vessel used.
The factor 0.99983 is yielded by 1 – 2 + d
2
÷ D
2
where: 2 = number of wires/bars
d = wire/bar diameter (0.7 mm*)
D = inner diameter of the vessel (76 mm*)
If you are using different vessels or other density kits, press
the
Param. soft key to enter any necessary changes in this calculation
factor.
To determine the density of a solid according to the buoyancy method
with our YDK 01 (LP) Density Determination Kit, make sure to use the
beaker with a 76 mm diameter.
Displacement: Rho = (Wa + (Rhofl – LA)) ÷ (Wfl + Corr) + LA
For the displacement method, a factor of 1.00000 (factory setting) is used
to allow for the buoyancy caused by a wire suspended in the liquid.
If you are using different vessels or other density kits, press the
Param.
soft key to enter any necessary changes in this calculation factor.
The equation takes the following variables into consideration: the number
of wires or bars, the wire/bar diameter of the sample holder, and the inner
diameter of the vessel used.
This factor is yielded by: Corr = 1 – χ + d
2
÷ D
2
where: χ = number of wires
d = wire diameter
D = inner diameter of the vessel
with: Rhofl = density of the reference liquid
Wa = weight of sample in air
Wfl = weight of the sample in liquid/buoyancy of sample
Corr = correction for buoyancy produced by the immersed
wires or bars of the sample holder:
0.99983 for the buoyancy method
1 for the displacement method
LA = correction for air buoyancy = 0.0012 g/ccm
Pycnometer: Rho = (Wa + (Rhofl – LA)) ÷ (Wfl + Wa – Wr) + LA
where: Rhofl = density of the reference liquid
Wa = weight of the sample
Wfl = weight of the reference liquid
Wr = weight of sample + the reference liquid
LA = correction for air buoyancy = 0.0012 g/ccm
* For the YDK 01 (LP) Density Determination Kit
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