Every object in our world has matter in it and takes space. Objects
are either

**solids**,

**liquids**, or

**gases**. We call
the relationship between an objects

**mass** and

**volume**,

**density**. Density is the amount of a mass divided
by the amount volume. In other words, how tight the matter is crammed into a certain space. It takes 2 pieces of equipment to measure the
density of an object. If the object is a

**regular object**,
meaning it has 3 flat straight sides, you would use a triple beam balance
(scale) and a ruler. If the object is an

**irregular object**,
meaning it has jagged or crooked sides, you would use a

**triple beam balance**
(scale) and a

**graduated cylinder**.

The formula for density is written

**D=m/v**. The units for density are

**grams/milliliter (g/mL)
**or

**grams/centimeters
cubed (g/cm**^{3}).

Finding the density of an object depends on what the dimensions are.
If the object has all flat, straight sides, it is a

regular object (related
to calculations). An example of this is a wooden block. In order to
find the

density of a wooden block, we would use a

triple beam balance
or scale

and a

ruler.
First, you would weigh the block’s mass by using
a triple beam balance. The mass is 320 grams. Next we measure the sides
using a metric ruler. The formula for finding volume of a solid object
is

length x

width x

height or l x w x h.

Length =

11 cm
Width =

9cm
Height =

4cm
11cm x

9cm x

4cm =

396cm^{3}.

Now the

density can be calculated using these measurements.

D =

320g/396cm^{3} Simplified D =

.81g/cm^{3}
If the object has jagged edges or is a shape other than a cube, then it is
an

irregular object. An example of this is a rock. In order to find
the

density of a rock, we would use a

triple beam balance or scale and
a

graduated cylinder. First, we would weigh the rock’s mass by using
a triple beam balance. The mass is

40 grams. Next we must use the graduated
cylinder to find the volume by displacing the water. The first cylinder
shows the water level before the rock was dropped in, which is

50 mL.
After the rock was dropped in, the level rose to

67mL. We find the difference
by subtracting the original water level from the new water level.

67mL -

50mL =

17mL.

Now the

density can be calculated using these measurements.

D =

2.4g/mL
m =

40g
v =

17mL