1. Density
Density = mass / volume (D = m/v) Mass = amount of stuff (matter) -- NOT weight, which is mass times gravity You weigh less on the moon, but your mass is the same.

2. Density
Volume = amount of space a thing occupies. L x W x H (cm3) or graduated cylinder (ml). ** Density measures how much stuff (mass) fits in a certain amount of space (volume).

3. Examples
Suitcase analogy Styrofoam cup Styrofoam bag vs. paper clip = more mass doesn’t mean more dense.

4. Density The more closely packed stuff is, the denser it is.
Water has a density of 1 g/cm3
Is a broken piece of rock the same density as the original rock?
YES.

5. Density
Temperature = how fast atoms are moving. Heat excites atoms and they bump into each other... temperature increases. Excited atoms move apart, so density decreases (less dense).

6. Temp. vs. Density

7. Density
Pressure: Pressure causes volume to decrease. Atoms get pushed together and packed tightly. As a result, density increases

8. Pressure vs. Density

10. Density
When Earth was formed: - dense material sank (mantle/core. - lighter material floated (crust) Density differences = convection. - weather - ocean currents