1. Chapter 2.6
What is density?

2. Density
Density is a measure of how tightly matter is packed into a given volume

3. Which box has more density?
1st box has more density

4. Which box has more density?
RED BOX

5. Formula for Density To calculate density, we use the formula
Density = mass
volume

6. EXAMPLE
Suppose you know the mass of an object is 30 g and the volume is 15 cm3.
Density = mass/volume
Density = 30g/15 cm3
Density = 2g/cm3

7. Density Continued
Density is a property that can be used to identify an object.
For example…
gold = 19.3 g/cm3
mercury = 13.6 g/cm3
lead = 11.3 g/cm3
silver = 10.5 g/cm3
aluminum = 2.7 g/cm3
rubber = 1.1 g/cm3
water = 1.0 g/cm3
cork = 0.24 g/cm3
air = g/cm3

8. Sink or Float???
Matter that has a greater density that water will sink in water.
Matter with a density lower than of water will float.

9. Coke vs. diet coke experiment
Which coke will float and which will sink??? Tell me your prediction.

10. Did you know???
Most people can float because their density is slightly less than that of water.

11. Self Check- page 44 What is density?
Which would have more matter – a 1-cm cube of lead or a 1-cm cube of rubber?
Suppose you have a metal bar. It’s mass is 57.9 g and it’s volume is 3 cm3. What is it’s density?
If you cut the metal bar from question 3 in half, what would the density of each half be?
What is the metal whose density you calculated in question 3?
If you put a piece of cork in a container of water, would it sink or float? Why? Hint - Use the table on the recent slide to help answer the question.