Determining the Specific Gravity/Density
Determining the Specific Gravity of Solids
Preparation
(Distilled water is used in the description)
– Center the large-diameter beaker (76 mm Ø) on the metal platform
– Fill it so that the distilled water is approximately 5 mm below the rim
– Add three drops of tenside to the distilled water
– Attach the thermometer to the rim of the beaker using the retainer clip
– Clean the sample holder with a solvent (especially the wires that will be
immersed) and hang it from the frame
Measuring Procedure
Determining the Weight of a Sample in Air
– Tare the balance
– Place the sample on the upper pan on the frame and weigh
– Record the weight W (a)
Determining the Buoyancy G = W (a) – W (fl)
– Tare the balance with the sample on the upper pan on the frame
– Place the sample in the sample holder
1
)
– Record the absolute readout of the buoyancy “G,” which is displayed with
a negative sign
1
) If you remove the pan hanger assembly from the measuring device to do this,
make sure that no additional air bubbles are on it when you re-immerse it; it
is better to place the sample directly on the pan using forceps or a similar utensil.
17
To Next Page