Density Sink or Float???.

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Presentation transcript:

Density Sink or Float???

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

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

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

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

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!!!!!

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