1. Density
Sink or Float???

2. Definitions Measure of amount of matter in a given volume
Simple definition: how much “stuff” is packed into a space

3. Float vs. Sink Objects LESS dense than liquid FLOAT
Objects MORE dense than liquid SINK

4. Formula Density is a measure of mass & volume To calculate:
D = Mass/Volume
Or abbreviated
D = M/V

5. Units for Density Combine a unit of Mass, and a unit of Volume
Remember base units
Mass = Grams (g)
Volume = milliliters (mL) or centimeters (cm3)
Why 2 units for volume?!?!
mL for fluids or irregular shaped objects
Cm3 for regular shaped objects
So, unit for density is either g/mL or g/cm3

6. Relation to Earth Science
Earth’s layers arranged due to density
Atmosphere (least dense)
Crust
Mantle
Core (most dense)
Minerals & other pure substances (ex/water) can be identified by their unique density
Ex/ gold = 19.3 g/cm3 ALWAYS!!!!!

7. Relationship btwn M, V & D
If Mass decreases and volume stays same, then density decrease.
If Mass increases and volume stays same, then density increases.
If Volume increases and mass stays same, then density decreases
If Volume decreases and mass stays same, then density increases