1. DENSITY
PRESSURE
and

2. Which is heavier…
A basketball?
Or a bowling ball?

3. Or a styrofoam block of the same size?
Which is heavier…
A metal block?
Or a styrofoam block of the same size?

4. Size Doesn’t Matter!
Objects that are the same size could have very different masses!
All materials are made of small particles called molecules…

5. They may be closely packed, like in a heavy metal block…
DENSITY
The molecules in different objects are arranged differently.
They may be closely packed, like in a heavy metal block…

6. Or they could be spaced out, like in a styrofoam block.
DENSITY
The molecules in different objects are arranged differently.
Or they could be spaced out, like in a styrofoam block.

7. DENSITY LOW density HIGH density
DENSITY describes how closely packed the particles of an object are.
HIGH density
LOW density

8. Density Columns Spread out for low density
If you drew in the molecules for your density column, what would it look like?
Spread out for low density
Closely packed for high density