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Mass and Volume

Mass and Volume. Butler Middle School 8th Grade Science Bob, Paul, Ms. Adams Oct 2, 2012 8th Grade Science. Distance Area. Volume and Space. Space is all around us Space is three-dimensional (3d) Volume is amount of space - liter is basic unit for measuring volume

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Mass and Volume

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  1. Mass and Volume • Butler Middle School • 8th Grade Science • Bob, Paul, Ms. Adams • Oct 2, 2012 • 8th Grade Science

  2. Distance • Area

  3. Volume and Space • Space is all around us • Space is three-dimensional (3d) • Volume is amount of space - liter is basic unit for measuring volume • 1 liter(l) is a common size - many drink containers are 1 liter bottles

  4. The big liter • The prefix milli means 1/1000 • To measure smaller volumes we use milliliters (ml) • 1 ml = 1/1000 l = 0.001 l

  5. The Liter is related to the Meter 10 cm = 1/10 m • A cube, 10 cm on each edge is a liter • This liter-cube has a volume of:10 cm x 10 cm x 10 cm = 1000 cubic centimeters • 1 liter = 1000 cc or 1 cc = 1/1000l = 1 ml • We can use cc or ml - they are the same

  6. Measuring Volume • For regular shaped objects like a block, we can calculate Volume • Block: V = L x W x H = 10cm x 3cm x 4cm = 120 cc

  7. Volume by Displacement • Calculating volume of irregular shaped objects is difficult • Measuring water displacementis a simple way of getting the volume of an odd shaped object • Volume of object is the volume ofdisplaced water: Vol = 265 cc - 200 cc = 65 cc

  8. Mass and Matter • Matter is Stuff all around us - Chairs, Tables, Students... - all matter takes up (occupies) space - empty space has no matter • Mass is amount of matter in something - gram is basic unit for measuring mass • 1 gram is small - 1 penny is about 3 grams • Mass of an object does not change, unless some matter (stuff) is removed or added to the object

  9. Weight • Weight is the pull of the earth’s gravity • Mass and weight are not the same • All matter on the earth has weight • Weight is a force, it is not measured in grams • Weight can change because gravity changes on earth and all throughout the universe • More on weight later in the year

  10. The little Gram • An average 8th grader has a mass of about 45,000 to 50,000 grams • A typical car has a mass of about 1,000,000 grams • A pack of hot dogs has a mass of about 500 grams

  11. “The big Kilo” • A more convenient unit of mass is the kilogram or sometimes called “a kilo” • 1 kilogram (kg) = 1000 grams (g) • The prefix kilo in front of anything means 1000

  12. Measuring Mass • We measure an unknown mass by comparing it to a known mass Triple beam balance

  13. Todays Lab Measure Mass & Volume of Test Objects • Use Triple Beam Balance to Measure mass • Measure Length, Width, Height of wood block, calculate Volume = L x W x H • Use Displacement Method to calculate volume of the other objects

  14. Using Triple Beam Balance • Slide the mass on each beam until you get to balance • Add the 3 masses to get mass of test object Notch

  15. Reading the Graduated CylinderLiquids in glass containers curve at the edgesThis is called the meniscus 52.8 ml 18mL, not 18.5 mL

  16. Optional: Calculate Volume of Marble & Cylinder and compare with displacement method

  17. 1/2 = 0.5 1/4 = 0.25 1/8 = 0.125 1/16 = 0.0625 1/32 = 0.03125 1/10 = 0.1 deci 1/100 = 0.01 centi 1/1000 = 0.001 milli 1000 = kilo Common fraction-decimal equivalentsand prefixes Num Convert any fraction Den to a decimal Den Num

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