1. Density
• A measure of how much
matter (mass) is contained in
a volume of a substance
Mass – “stuff”
Volume- “space”
Density- how much “stuff” is
in the “space” of a substance

2. Density
Depends on:
The type of atom(s)
Lead atoms are more
massive than
aluminum atoms

3. Density
How tightly packed
the atoms are
Water molecules are
closer together than
O2 and N2 in the air

4. Density
 Water – 1 g/cm3
 Every cm3 weighs
1g
 1 cm3 = 1mL
 Oil- 0.9 g/cm3

5. Density
D = m/V
D = density in g/cm3
m = mass in g
V = volume in cm3

6. Density
• Find mass with a
balance or a scale
• Find volume:
• Length x width x height
or
• Water displacement

7. Density
• Find mass with a
balance or a scale
• Find volume:
• Length x width x height
or
• Water displacement