Ohaus CARAT PLUS PRECISION JEWELRY BALANCES Density Determination Kit Manual - Manual (Page 6)

6
PERFORMING DENSITY DETERMINATION (Cont.)
For density determination of solids with a density less than 1 g/cm 3 , the bottom of the
Weigh Below Hook for solids must be used as it holds the solid body below the surface
of the auxiliary liquid. If the buoyancy of the solid is greater than the weight of the Weigh
Below Hook, the Weigh Below Hook must be weighted by placing an additional mass
on the submerged part of the Weigh Below Hook as shown in Figure 11.
After loading the additional mass, tare the balance and start the weighing again.
1. Wait until the balance has reached stability and note the displayed weight P
(buoyancy of the solid).
2. Now determine the density Q
1
of the solid by dividing the first weight A (weight of
the solid in air) by the second result P (buoyancy) and multiplying this result by the
known density Q
0
of the auxiliary liquid (at the temperature read off of the
thermometer).
Q
1
= • Q
0
[g / cm 3 ]
A
P
Figure 11. Buoyancy Sample Weighing.
Sample
Mass
density kit.pmd 8/9/2005, 1:12 PM 6