• Density is a physical property of matter, as each element and compound has a unique density associated with it.

• In a qualitative manner, it is defined as the measure of the relative “heaviness” of objects with a constant volume

• Density may also refer to how closely “packed” or “crowded” the material appears to be

• The formal definition of density is mass per unit of volume

• Usually density is expressed in grams per mL or cc

• CC is cubic centimeter which is equal to a mL

• Per statement is translated to division

Density = mass =   g/mL     volume  

Example 1:

Calculate the density in g/mL of aluminum if a 50 mL block weighs135 g.

Solution:

Apply the Definition

Density = 135 g = 2.70 g/mL 50 mL

Solving for Density:

D = M V

Solving for Mass:

M = V x D

Solving for Volume:

V = M D

Example 2:

Iron has a density of 7.87 g/cm3 . What is the mass of 250 cm3 of iron?

Solution:

Apply the Definition

7.87 g/cm3 = _M__ 250 cm3

1967.50 g

1. A piece of metal has a mass of 45.6 grams and a volume of 110 cm3 . What is itsdensity?

2. Aluminum has a density of 2.70 g/cm3 . What is the mass of a cube of aluminum that measures 9.3 cm on a side?

3. If a block of wood has a density of 0.6g/cm3 and a mass of 120g, what is its volume?

4. If you have a gold brick that is 2cm by 3cm by 4cm and has a density of 19.3g/cm3, what is its mass?