1. DENSITY RULES

2. All pieces of the SAME material (no matter what the size) should have the
density.
When a piece breaks, the density of each piece is the same as the original.
SAME
Constant relationship
density
Why? The atoms are still packed the same
size

3. How to change the density of a material?

4. The only way to change the density of a material is to change the way the atoms “pack”. The easiest way to do this is to change its temperature or pressure.

5. a. Temperature

6. a. Temperature
As an object is heated, it expands (volume increases) and the atoms become less packed.
Therefore the object becomes less dense.

7. When an object is cooled, it contracts (come together) and the atoms become more packed.
Therefore, the object becomes more dense.

8. Indirect Relationship
Density
Temperature
As temperature increases, density __________
Decreases

9. a. Pressure Pressure – the force applied to a unit area of surface
Volume – decreases
Mass – remains the same
Density - increases

10. As pressure increases, density ____________ Increases
Direct Relationship
As pressure increases, density ____________
Increases

11. 3. Density of Water 1g/cm3 Density of water is:
It is most dense at 3.98o C because the water expands above and below this temperature
ESRT Page 1

13. 4. Less dense objects will on top of more dense objects
4. Less dense objects will on top of more dense objects. The dense objects will be on the bottom and the less dense on top.
float

14. Graphing and Density
If volume is on the independent variable (X-axis) and mass is the dependent variable (Y-axis), then the slope of the line will indicate the ________ of the material being graphed.
density

15. Slope = density = mass Slope = rise run = Density volume Mass (g)
Volume (cm3)
Slope = rise run
= mass
volume
= Density

16. Density of Water Slope = rise run = mass volume = Density 3 3 =
Mass (g)
Volume (cm3)
Slope = rise run
= mass
volume
= Density
3 3 =
= 1g/cm3

17. More Dense
Water
Mass (g)
Less Dense
Volume (cm3)
run
volume