Ohaus Density Determination Kit Manual - Manual (Page 6)

EN-3 Density Determination Kit
2 Preparing the balance for density determinations
This section describes how you can convert your balance to determine
densities. Please follow the steps as below.
Select the pan support according to your balance as described in Section 1.2.
Remove the cover of tape on the pan support, and adhere centrally to the
bottom of the bracket (2).
1. Open the draft shield door and remove the weighing pan.
2. Place the bracket with the pan support on the weighing cone.
3. Place the platform (4) above the bracket. The three support feet should be
between the weighing arms of bracket and stand stably on the bottom
plate of draft shield.
Note: The bracket must not touch the platform under any
circumstances!
3 Principle of the density determination
The density ρ is the quotient of the mass m and the volume V.
The international system of units specifies Kg/m
3
as the unit of density. However, the unit g/cm
3
is better suited
to lab purposes.
Density determinations are frequently performed by Archimedes’ principle, which is also used with the density
determination kit for the balances. This principle states that every solid body immersed in a fluid apparently
loses weight by an amount equal to that of the fluid it displaces.
The procedure for the density determination by Archimedes’ principle depends on whether the density of
solids or liquids has to be determined.