1. Density

2. Think About It! Which weighs more?
100 grams of feathers or 100 grams of bricks?

3. Think About It! Which weighs more?
100 grams of feathers or 100 grams of bricks?

4. They have the same mass! But their volumes are different.
Think About It!
They have the same mass!
But their volumes are different.

5. Let’s Compare their Volumes!
Bricks
Mass = 100 g
Volume = 3 cm3
Feathers
Mass = 100 g
Volume = 200 cm3

6. Picture It!
How many feathers would have to fit in one container in order to weigh the same as one brick?
Bricks are more dense than feathers.

7. Density Equation
Density = Mass
Volume
Units: g/ml or g/cm3 ** 1 mL = 1 cm3

8. Density Equation
Density = Mass
Volume
Units: g/ml (liquid) or g/cm3 (solids)

9. Is it less dense or more dense?
If substances have different densities, they will often sink or float when combined with one another.
Example: Oil and Water (demo)
Density of oil: 0.93 g/cm3
Density of water: 1.00 g/cm3

10. Is it less dense or more dense?
Egg Demo
Will both eggs float? Why or why not?

11. Is it less dense or more dense?
Density of salt water: g/mL
Density of water: 1.00 g/mL

12. Is it more dense or less dense?
What does this mean?
More dense = sinks
Less dense = float or sit on top of more dense substance

13. Let’s do some calculations!
The measurements of a piece of wood are as follows:
Mass = 500 grams
Length = 50 cm Width = 10 cm Height = 5 cm
If density is equal to mass/volume, what is the density of this piece of wood?

14. Let’s do some calculations!
A piece of iron weighs 100 g. It has a volume of about 50,000 cm3 . Calculate its density. Watch your units!
What do the units mean?

15. Float or Sink?
Liquid #1 has a density of 0.80 g/mL is combined with Liquid #2 whose density is 1.20 g/mL.
Which will liquid will float and which will sink?

16. Float or Sink?
Liquid #1 has a density of 0.80 g/mL is combined with Liquid #2 whose density is 1.20 g/mL.
Which will liquid will float and which will sink?
LIQUID #1 WILL FLOAT ON TOP OF LIQUID #2.
WHY?

17. Float or Sink?
Liquid #1 has a density of 0.80 g/mL is combined with Liquid #2 whose density is 1.20 g/mL.
Which will liquid will float and which will sink?
LIQUID #1 WILL FLOAT ON TOP OF LIQUID #2.
WHY? ----> It is less dense.

18. Float or sink?
Liquid #3 has a density of 1.00 g/mL.
Liquid #4 has the density of 2.05 g/mL.
When combined, which liquid will float on top and which will sink in the container?

19. Float or sink? Liquid #3 has a density of 1.00 g/mL.
Liquid #4 has the density of 2.05 g/mL.
When combined, which liquid will float on top and which will sink in the container?
LIQUID #3 WILL FLOAT AND #4 WILL SINK!

20. Float or sink? Liquid #3 has a density of 1.00 g/mL.
Liquid #4 has the density of 2.05 g/mL.
When combined, which liquid will float on top and which will sink in the container?
LIQUID #3 WILL FLOAT AND #4 WILL SINK!
WHY? > Liquid #3 is less dense than liquid #4.