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MASS, VOLUME, & DENSITY

Measuring Matter. MASS, VOLUME, & DENSITY. MASS…. Definition: Amount of matter in an object Units: kg or g Mass is different from weight because…Weight depends on pull of gravity. VOLUME…. Definition: How much space an object takes up

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MASS, VOLUME, & DENSITY

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  1. Measuring Matter MASS, VOLUME, & DENSITY

  2. MASS… • Definition: Amount of matter in an object • Units: kg or g • Mass is different from weight because…Weight depends on pull of gravity

  3. VOLUME… • Definition: How much space an object takes up • Regular shaped object (box) = L x W x H (cm3 or m3) • Liquids - to find volume…use graduated cylinder (mL or L) • Use graduated cylinder for odd shaped solid objects (cm3 or m3)

  4. 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

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

  6. 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

  7. 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

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

  9. 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.

  10. 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.

  11. Principle 3 • Just because something has more mass DOES NOT mean it is more DENSE.

  12. Go to the following websites to learn about density….. • http://www.windows.ucar.edu/tour/link=/glossary/density_defn.html&edu=elem • http://www.edinformatics.com/math_science/density.htm?inputbox=0.852 • http://www.elmhurst.edu/~chm/vchembook/120Adensity.html

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