MASS, VOLUME,

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Measuring Matter

• MASS, VOLUME, DENSITY

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MASS

• Definition Amount of matter in an object
• Units kg or g
• Mass is different from weight becauseWeight
  depends on pull of gravity

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VOLUME

• Definition How much space an object takes up
• Regular shaped object (box) L x W x H (cm3 or
  m3)
• Liquids - to find volumeuse graduated cylinder
  (mL or L)
• Use graduated cylinder for odd shaped solid
  objects (cm3 or m3)

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How to measure the volume of an odd shaped solid

• Obtain a clean graduated cylinder.
• Fill the graduated cylinder with enough water to
  cover object. Record the volume
• Carefully place the object into the water filled
  graduated cylinder.
• Record the new water level.
• The volume of the object is the Vfinal Vinitial

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DENSITY.

• Density is the measurement of the mass of an
  object per unit volume of that object.
• Formula
• D (density) m (mass)
• V(volume)

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DENSITY . continued

• Density is usually measured in g/mL for liquids
  and g/cm3 for solids.
• Remember 1 mL 1 cm3
• Density of water is 1.00g/mL

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Example Density Calculation

• A rock has a mass of 25.7 grams and a volume of
  3.56 cm3. Find the density.
• 1st write D mass
• volume
• 2nd Substitute in the measurements
• D 25.6 g
• 3.56 cm3
• 3rd Calculate following sig fig rules.
• Density 7.19 g/cm3

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PRACTICE.

• Calculate the density of a marble that has a mass
  of 13.6 grams and a volume of 6.1 cm3.

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Principle 1

• If you pack more mass into the same volume, it is
  more dense.
• Draw a picture on your handout that represents
  this principle.

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Principle 2

• If you pack the SAME mass into a SMALLER volume,
  it is MORE dense
• Draw a picture on your handout that represents
  this principle.

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Principle 3

• Just because something has more mass DOES NOT
  mean it is more DENSE.

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Go to the following websites to learn about
density..

• http//www.windows.ucar.edu/tour/link/glossary/de
  nsity_defn.htmleduelem
• http//www.edinformatics.com/math_science/density.
  htm?inputbox0.852
• http//www.elmhurst.edu/chm/vchembook/120Adensity
  .html