Density
What is Density?
• Density is how closely packed
together molecules are in a
substance.
• Formula: Density = mass
volume
•D=m
V
What Unit will we use for
density?
• Any mass unit over any volume
unit.
• Some common examples:
g/cm3 kg/cm3 g/m3
3
mg/mL g/L cg/mm
If a block has a mass of 24 g
and a volume of 15.6 cm3, what
is it’s density?
Divide
the mass by the
volume.
D = 24 g
3
15.6 cm
3
D = 1.53846 g/cm
D = 1.5 g/cm3
Let’s find the density of
your textbook.
• Your book has a mass of 1400
g, a length of 20.68 cm, a width
of 3.95 cm, and a height of
26.10 cm.
We can also find the mass or
volume of a substance using
density.
• The density of iron is 7.86
g/cm3. If the mass of a
piece of iron is 47 g, what is
the volume of the iron?