14-2 Measuring Matter
Volume
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Definition: Amount of space an object takes up
Metric Units: SI unit is Liters (L)
How to find volume
Solids: ruler to measure length x width x height (units3)
 Irregular Solids: water displacement method
 Liquids: use a graduated cylinder to measure volume
and convert 1 mL = 1 cm3
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1 ml of H2O will fill
1 cm x 1 cm x 1 cm
Mass
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Definition: The amount of matter in an object
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Constant number, never changes for a given sample
Metric Unit : SI unit is grams (g)
90 pounds on earth is ~40 kg
 1 nickel ~ 5 g ;
1 baseball ~ 150 g
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Tools used to find mass
Triple Beam Balance
 Electronic Balance
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Weight: Measurement of the force of gravity
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Changes with location/altitude
Density
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Definition: Amount of mass in a given volume
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Characteristic Property:
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Different substances may have the same mass,
but they don’t fill the same volume
Never changes for a given substance
Metric Units: SI unit is grams per milliliter (g/mL)
How to find density:
Density = Mass/Volume
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Density of water: 1 g/ml or 1 g/cm3
Oil & Water don’t mix? lower density floats on top
Density CALCULATIONS
 Always
show all of your work
 Answer must have correct units!!!
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Calculate the density of a marble that
has a mass of 13.6 grams and
a volume of 6.1 cm3?