Density Overview

What is the density of oil?

A) Less than 1 g/cm3

B) Equal to 1 g/cm3

C) Greater than 1 g/cm3

1 cm

1 cm

1 cm 1 g

What is Mass?

•How much stuff (matter) an object has

•Measured in grams

What is Volume?

•Amount of space an object takes up

•Measured in cm3

Calculating Volume

Volume = L x W x H

= 2 x 2 x 2

= 8 cm3

2 cm2 cm

2 cm

8 Cubic Centimeters!

Density is…

•Mass per unit Volume

Which is denser?

2 identical fish tanks with pollywogs in each.

Mass

Volume

Important

Density =

3

Calculating Density

Density = Mass/Volume

= 24/8

= 3 g/cm3

2 cm2 cm

2 cm 24 g

Water has a density of…

1 gram/cubic centimeter

= 1 g/cm3

= 1 g/ml What is the mass of 2 L?

2000 grams!

What is the density of oil?

A) 1 g/cm3

B) 1.1 g/cm3

C) 0.97 g/cm3

D) 3.2 g/cm3

Review

1. Why does a cube of ice float in water?

Water versus Ice

Water

Question 1

2 g 10 g 20 g

Three cubes have the same volume, but very different densities. Which cube has the greatest density?

Question 2

12 g

Three cylinders have the same volume, but very different densities. Which cylinder will displace the most water when submerged? Or will each cylinder displace the same volume of water?

32 g 8 g

Review

Which is denser?

Both boxes have the same volume.

What is the density of the ship?

Review

Which one is more likely to float in H2O?

Both boxes have the same volume.

Does cutting change density?

• No! • The ratio of mass to volume

remains constant.• Both mass and volume

change proportionally.• 20/4 = 5 g/cm3• 10/2 = 5 g/cm3

• 5/1 = 5 g/cm3

Density Overview