Rice Lake Discovery Series Semi-Micro and Analytical, Ohaus - Manual (Page 25)

EN-21 Ohaus Discovery
3.5.9 Density (Cont.)
Liquid Density Determinations
The density of a liquid can be made using a sinker of known volume. The sinker (sinker is not included in the kit) is weighed in air and then in
the liquid whose density is to be determined, The density, Q, can be determined from the two weighings as follows:
Q = Density of the liquid
A = Weight of the sinker in air
B = Weight of the sinker in liquid
V = Volume of the sinker
P = Buoyancy of the sinker in the liquid
( P = A-B)
A - B
V
Q =
In DENSITY SETUP, set Mode to Liquid Density and enter sinker volume in cc’s.
After weighing the sinker in air and then weighing the sinker immersed in liquid, the balance calculates the density of the liquid and is displayed
in grams/cc. See illustrations below for placement of the sinker. When the sinker is immersed in the liquid, it must not come into contact with
the bottom of the beaker.
Sinker
Sinker
Sinker in Air Sinker in water
Porous Material Density Determinations
The density of a porous (oil impregnated part) can be made with the balance. Weigh the part (dry) prior to oil impregnation and record its
weight. You must also know the density value of the oil to be used in immersing the part before starting. In this procedure, you will follow the
method for solid density measurements using water.
Enter the dry weight of the porous material and the density of oil used to impregnate the part.
To Determine Wet Density
Wet density of the sample can be calculated by following the normal Solid Density procedure using the oil impregnated part.
80104130.indd 21 11/7/2006 9:22:37 AM