### Density

```DENSITY
By Sandra Mood
DENSITY
WHAT IS DENSITY?
Density is a measurement of how solid
something is.
Specifically it is the mass per unit volume of
a substance.
If you have two objects of the exact same
size (volume), the more dense object will
weigh more than the less dense object.
DENSITY
DENSITY
SO THERE ARE TWO THINGS
CONTRIBUTING TO DENSITY
:
1.The mass of the atoms or molecules that
makes up the material.
2.The volume or amount of space the material
takes up. If the molecules or atoms are
“packed” in more closely, it will be more
dense.
FOR EXAMPLE, STYROFOAM IS A LOW DENSITY
MATERIAL. EVEN A LARGE STYROFOAM CONTAINER
DOES NOT WEIGH MUCH. THE MOLECULES IN THE
STYROFOAM DO NOT HAVE MUCH MASS AND THERE IS
A LOT OF SPACE BETWEEN THEM. A BRICK, ON THE
OTHER HAND, IS MUCH MORE DENSE. EVEN A
MODERATE SIZED BRICK CAN BE PRETTY HEAVY. THIS IS
BECAUSE THE MOLECULES WHICH MAKE UP THE ROCK
HAVE MORE MASS AND ARE PACKED MORE CLOSELY
TOGETHER.
WHICH HAS A GREATER DENSITY1KG OF WATER OR 10 KG OF WATER?
The density of any amount of water is the
same:
This means that the ratio of mass/volume is
the same for any amount of water.
WHICH HAS A GREATER DENSITY-5 KG
OF LEAD OR 10 KG OF ALUMINUM?
Since density is a ratio of weight or mass
per volume, and the ratio is greater for any
amount of lead that for any amount of
aluminum.
WHICH HAS THE GREATER DENSITY-AN
ENTIRE CANDY BAR OR HALF A
CANDY BAR?
Both the half and the full candy bar have
the same density.
WHAT HAPPENS TO THE VOLUME OF A
LOAF OF BREAD THAT IS SQUEEZED?
• What happens to the mass?
• What happens to the density?
```