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S4
Density
Density is a material property.
The density of an object varies as a ratio of mass to volume.
Specific materials have specific densities.
Density is a measure of the amount of mass contained in a unit of volume.
SI Units
Kg/m
3
Kg/cm
3
g/cm
3
g/ml
Imperial Units
lbs/ft
3
lbs/inch
3
lbs/yd
3
oz/inch
3
Example Material Densities
Aluminum 2.7 g/cm
3
Steel 7.84 g/cm
3
Copper 8.85 g/cm
3
Gold 19.32 g/cm
3
Titanium 4.5 g/cm
3
Polycarbonate 1.3 g/cm
3
The average density of an object is the combination of the densities and respective volumes of
the different materials contained in an object. For example, automobile components are made of
steel, glass, plastic, aluminum and dozens of other materials. If you computed the average
density of a specific car, it would reflect the average densities and volumes of the materials from
which that car was made. And you would not get an accurate measure of the “Density” of cars,
because cars differ in the proportions of materials they use.
Volume
Mass
Density
or
Volume
Weight
Density
Same
Volume
More Mass
Same
Volume
Less Mass
Objects can have the same
volume but different mass. This
is because materials have
different densities.
Sample Science Curriculum