1. A Look at Density and How to Calculate It

2. Remember… VOLUME = amount of space something takes up
MASS = amount of matter in an object (the “stuff” inside)

3. Remember…
VOLUME is measured in milliliters (mL) or in cubic centimeters (cm³)
MASS is measured in grams (g)

4. Remember… VOLUME is the amount of space you have and….
MASS is how much of something you have.

5. Bring it Together: Density is a combination of volume and mass.
Density is the amount of matter in a given volume.
The amount of “stuff” in a certain “space”

6. Definition of DENSITY:
The RATIO of the mass of a substance to the space it takes up (volume)
Substances have a characteristic density
Determined by how compact the atoms are inside:
solids have high densities
gases have low densities

7. Can you think of an exception to this rule?

9. Figuring it Out
There is a mathematical formula for calculating density:
Density = Mass ÷ Volume
D = M V

10. Units for Density
Just like length, volume and mass, density has to be labeled with the correct unit…
g/cm³ or g/mL is the standard unit for density.
1cm³ = 1mL

11. Let’s Practice! Liquid E had a mass of 82.61g and a volume of 100mL
Plug it into the formula…

12. Let’s Practice!
D = M ÷ V
82.61g
100mL
D = g/mL

13. Will it Float?
Density can predict if something will float. How?

14. Will it Float? The density of water is 1 g/mL.
The object with a higher density than water will sink.
Think of some examples…

15. It Floats If it has lower density it will float.
Think of some examples…