Page 2
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
Page 3
What is Mass?
•How much stuff (matter) an object has
•Measured in grams
Page 4
What is Volume?
•Amount of space an object takes up
•Measured in cm3
Page 5
Calculating Volume
Volume = L x W x H
= 2 x 2 x 2
= 8 cm3
2 cm2 cm
2 cm
8 Cubic Centimeters!
Page 6
Density is…
•Mass per unit Volume
Which is denser?
2 identical fish tanks with pollywogs in each.
Page 7
Mass
Volume
Important
Density =
3
Page 8
Calculating Density
Density = Mass/Volume
= 24/8
= 3 g/cm3
2 cm2 cm
2 cm 24 g
Page 9
Water has a density of…
1 gram/cubic centimeter
= 1 g/cm3
= 1 g/ml What is the mass of 2 L?
2000 grams!
Page 10
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
Page 11
Review
1. Why does a cube of ice float in water?
Page 12
Water versus Ice
Water
Page 13
Question 1
2 g 10 g 20 g
Three cubes have the same volume, but very different densities. Which cube has the greatest density?
Page 14
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
Page 15
Review
Which is denser?
Both boxes have the same volume.
Page 16
What is the density of the ship?
Page 17
Review
Which one is more likely to float in H2O?
Both boxes have the same volume.
Page 18
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