1. Density The ratio between the object’s mass and its volume.
Chapter 3.4
Density
The ratio between the object’s mass and its volume.

2. Base Unit Length l meter m Mass m kilogram kg Volume v cm3 Temp T
SI Units
Symbol
Base Unit
Abbrev.
Quantity
Length l
meter m
Mass m
kilogram kg
Volume v
cm3
cubic centimeter
Temp T
kelvin K

3. M V D = Density Mass Density = Volume
Density is a characteristic (physical) property that depends only on the composition of a substance, not on the size of the sample.
The composition of a mixture can vary therefore the density can vary. M V
D =

4. Density
Mass (g)
Volume (cm3)

5. Sample Problem 3-5
A copper penny has a mass of 3.1g and a volume of 0.35 cm3. What is the density of copper?
Density = mass
volume
Density = 3.1g
0.35 cm3
= g/cm3
= 8.9 g/cm3