Density Sink or Float???. Definitions Measure of amount of matter in a given volume Simple...
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Transcript of Density Sink or Float???. Definitions Measure of amount of matter in a given volume Simple...
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