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/VolumeOr abbreviatedD = M/V
5 Units for Density Combine a unit of Mass, and a unit of Volume Remember base unitsMass = Grams (g)Volume = milliliters (mL) or centimeters (cm3)Why 2 units for volume?!?!mL for fluids or irregular shaped objectsCm3 for regular shaped objectsSo, unit for density is either g/mL or g/cm3
6 Relation to Earth Science Earth’s layers arranged due to densityAtmosphere (least dense)CrustMantleCore (most dense)Minerals & other pure substances (ex/water) can be identified by their unique densityEx/ 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 decreasesIf Volume decreases and mass stays same, then density increases