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**Mass and Volume Butler Middle School 8th Grade Science**

Bob, Paul, Ms. Adams Oct 2, 2012

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Distance Area

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**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

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**The big liter The prefix milli means 1/1000**

To measure smaller volumes we use milliliters (ml) 1 ml = 1/1000 l = l

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**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 = 1/1000 l = 1 ml We can use cc or ml - they are the same

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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

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**Volume by Displacement**

Calculating volume of irregular shaped objects is difficult Measuring water displacement is a simple way of getting the volume of an odd shaped object Volume of object is the volume of displaced water: Vol = 265 cc cc = 65 cc

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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 penny is about 3 grams Mass of an object does not change, unless some matter (stuff) is removed or added to the object

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**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

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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

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“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

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

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**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

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**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

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Reading the Graduated Cylinder Liquids in glass containers curve at the edges This is called the meniscus 18mL, not 18.5 mL 52.8 ml

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

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**Common fraction-decimal equivalents and prefixes**

1/2 = 0.5 1/4 = 0.25 1/8 = 0.125 1/16 = 1/32 = 1/ = deci 1/100 = centi 1/1000 = milli 1000 = kilo Num Convert any fraction Den to a decimal Den Num

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