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MASS, VOLUME, & DENSITY

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MASS… Definition: Amount of matter in an object Units: kg or g Mass is different from weight because…Weight 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 (cm 3 or m 3 ) Liquids - to find volume…use graduated cylinder (mL or L) Use graduated cylinder for odd shaped solid objects (cm 3 or m 3 )

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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 V final – V initial

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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/cm 3 for solids. Remember 1 mL = 1 cm 3 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 cm 3. Find the density. 1st write: D = mass volume 2nd: Substitute in the measurements D = 25.6 g 3.56 cm 3 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 cm 3.

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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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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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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/density_defn.html&edu=elemhttp://www.windows.ucar.edu/tour/link=/ glossary/density_defn.html&edu=elem http://www.edinformatics.com/math_ science/density.htm?inputbox=0.852http://www.edinformatics.com/math_ science/density.htm?inputbox=0.852 http://www.elmhurst.edu/~chm/vchembo ok/120Adensity.htmlhttp://www.elmhurst.edu/~chm/vchembo ok/120Adensity.html

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