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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?