Density
Density is the measure of how much mass
is contained in a given volume
* density is made up of two measurements mass and volume,
so the density of an object is expressed as a relationship between
two units
Density = mass
volume
D=m/v
1. grams/cubic centimeter
2. grams/milliliter
g/cm3
g/mL
(units solids)
(units liquids)
Remember the methods are different for finding the
volumes of Regular Objects, Irregular Objects, and Liquids
The density of an object does not change as its size changes.
Example: The density of pure gold is 19.3 g/cm3 no matter
the size of the piece of pure gold
Once you know an object’s density you can then determine
whether or not it will float in a given liquid.
Example:
An object will FLOAT if it is LESS dense than the liquid
An object will SINK if it is MORE dense than the liquid
Water has a known density of 1.0g/cm3 or 1.0g/mL
remember: 1cm3 = 1mL , so these two densities are EQUAL
Let’s Practice:
1. Mass 50g Volume 10mL
2. Mass 20g Volume 40cm3
Density = ___________
Density = ___________
3. Density 8.0 g/cm3 Volume 10cm3
4. Density 4.0 g/mL Mass 2.0g
Mass= _____________
Volume = ___________