Properties of Liquids Density Definitions Density The mass

Properties of Liquids: Density

Definitions Density: The mass per unit volume of a material.

Density l l l The symbol for density is usually D and has units of g/cm 3. Density is a physical property of a material. Often, a material’s density is used to identify it. Densities of Common Materials Water 1. 00 g/cm 3 Aluminum 2. 7 g/cm 3 Steel 7. 9 g/cm 3 Gasoline . 70 g/cm 3 Mercury 13. 6 g/cm 3 Air . 0013 g/cm 3

Density l l Solids, liquids, gases, and other phases of matter all have densities. Solids are most dense, liquids next dense, and gases least dense D= = m V Which weighs more, A pound of feathers or a pound of lead? Which is more dense?

A Density Problem: Does this help? l l l You found this ring on the track at your school. You wondered what it was made of. You calculated its density to be approximately 7. 9 g/cm 3. What is it made of? Metal Density g/cm 3 Aluminum 2. 70 Gold 19. 30 Copper 8. 63 Steel 7. 87 Silver 10. 40 Chromium 7. 10 Lead 11. 30

A Density Problem: l A 10. 0 cm 3 sample of an unknown metal has a mass of 89. 6 g. What is the density of the unknown metal? According to the chart, what is the unknown metal? Does this help? Metal Density g/cm 3 Aluminum 2. 70 Gold 19. 30 Copper 8. 63 Steel 7. 87 Silver 10. 40 Chromium 7. 10 Lead 11. 30