Transcript The Bulk Density of a Brick

The Bulk Density of a Brick
Water Displacement Method
Density
Density, ρ =
Mass
Volume
The Greek symbol used for density is ρ which is
pronounced “ro”.
Density
Mass is relatively easy
as the brick can be weighed in air
to give its mass (m1 gm)
Mass in air, m1 = 2138.0 gm
Density
Volume is more difficult
as the brick is quite a complicated shape,
it is not very evenly shaped
and it has quite a rough surface.
Density
However, the Volume can be calculated
by weighing the brick in air (m1 gm) and then
weighing it fully immersed in water (m2 gm)
The mass of water displaced by the brick =
Mass in air (m1 gm) – Mass in water (m2 gm)
Mass in water m2 = 1030.2 gm
Density
The density of water, ρw, can be assumed
to be 1 gm/cm3
Hence, the volume of the brick is numerically the
same as the mass of water displaced
Density
The density can now be calculated
Density, ρ =
m1
x ρw
(m1 – m2)
Density
Let us put the numbers in for our brick
Density, ρ =
m1
x ρw
(m1 – m2)
Density, ρ =
2138.0
x1
g/cm3
2138.0 – 1030.2
= 1.93 g/cm3
As 1 g/cm3 is the same as 1000 kg/m3, the density
can also be stated as 1930 kg/m3 which is nearly
2 Tonnes per m3