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

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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 liter(l) is a common size - many drink containers are liter bottles

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The big liter The prefix milli means To measure smaller volumes we use milliliters (ml) ml l l

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

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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 Measuring Volume

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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 - 200 cc = 65 cc Volume by Displacement

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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 gram is small - penny is about 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 grams A typical car has a mass of about 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 Triple beam balance We measure an unknown mass by comparing it to a known mass

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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 = 0.0625 1/32 = 0.03125 1/10 = 0.1 deci 1/100 = 0.01 centi 1/1000 = 0.001 milli 1000 = kilo Num Convert any fraction Den to a decimal Den Num

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