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Topic: The Metric System Do Now: Calculate the volume of Fe. What element is Fe? mass of Fe(s) = 15.9 g density of Fe(s) = 7.87 g/cm3

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Measurement up to 1790: Not a pretty picture! standard Measurement requires standard and until 1790s every region had own standard

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Systeme International (SI) created French Academy of Sciences created the metric system in 1790* Originally, earth-based standards Volume & mass linked to length Larger & smaller multiples of each unit related by powers of 10 = metric system *updated every few years (particularly in in 1960 and 1991)

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Standards standard: something used as comparison for measuring standard must: available for everyone be available for everyone to use to check measurements be something in nature that is same everywhere be something in nature that is same everywhere never vary never vary

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second What is a second? defined in terms of electron transitions in Cs-133 (Caesium an element)

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What is a meter? / distance light travels in vacuum in 1/299,792,458 th of second

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Liter What is a Liter? defined as cube measuring 10 centimeters on each side (1000 cm 3 ) Liter based on meter, which is based on Earth 10 cm

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kilogram What is a kilogram? 10 cm defined as mass 1 Liter water at 4C Why water Why water? kilogram is based on liter, which is based on meter, which is based on Earth

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For Water only:

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kilogram Prototype kilogram stored in vault in France

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Smaller Units 1/10 of a meter = decimeter (dm) 1/100 of a meter = centimeter (cm) 1/1000 of a meter = millimeter (mm) Larger Units 10 meters = dekameter (dam) 100 meters = hectometer (hm) 1000 meters = kilometer (km)

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UsePowerValueSymbolPrefix Gigabyte 10 9 1,000,000,000 GGiga Megamillion 10 6 1,000,000MMega kilometer 10 3 1,000kKilo decimeter 10 -1 0.1ddeci centimeter 10 -2 0.01ccenti millimeter 10 -3 0.001mmilli micrometer 10 -6 0.000001 micro nanometer 10 -9 0.000000001nnano Prefixes in the SI System Dont copy. where can you find?

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Fundamental or Base Units Based on object or event in nature 7 The SI system has 7 fundamental units *label on Ref table

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AbbreviationNameQuantity mmeterLength kgkilogramMass KkelvinTemperature ssecondTime cdcandela Luminous Intensity Aampere Electric Current molMole Amount of Substance 7 Fundamental Quantities of SI

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Derived Units Combinations of fundamental units Examples: Speed Speed (meters/second) Area Area (Length x Width) Volume Volume (Length x Width x Height) Density Density (Mass / Volume)

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Prefixes prefixes can be used with all 7 fundamental units! meter Kilometer liter Milliliter gram Centigram second Microsecond kelvin Nanokelvin

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1790 - Jefferson Proposed decimal-based measurement system for United States Didnt have prefix idea and system had too many names.and so we are stuck using feet, inches, cups, ounces, etc

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Kids Have Dropped Dead Converting Metric

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KILO 1000 Units HECTO 100 Units DEKA 10 Units DECI 0.1 Unit CENTI 0.01 Unit MILLI 0.001 Unit Meters Liters Grams Ladder Method How do you use the ladder method? 1 st Determine your starting point. 2 nd Count the jumps to your ending point. 3 rd Move the decimal the same number of jumps in the same direction. 4 km = _________ m 1 2 3 How many jumps does it take? Starting Point Ending Point 4. 1 __. 2 3 = 4000 m