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MEASUREMENT

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**Determination of amount of something**

Measurement Determination of amount of something Number value and a unit Unit – standard amount that everyone agrees with

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**Only 2-3 Countries use this**

ENGLISH SYSTEM United States Common measurements Miles, yards, feet, inches, pounds, pints, quarts, gallons, cups, teaspoon Only 2-3 Countries use this (its an old system)

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**International System of Units ”SI”**

Metric system created in 1800’s in France Relates all units to form a base of 10 1960 named SI U.S. is the only industrialized nation not to adopt the SI

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**“SI” base units Length - meters Mass - grams Volume - liters**

Temperature - Kelvin or Celsius

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UNCERTAINTY All physical measurements are to some extent uncertain. The degree of percision is indicated by SIGNIFICANT FIGURES

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**Metric Conversions Ladder Method**

T. Trimpe

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**How many jumps does it take?**

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

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Conversion Practice

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UNCERTAINTY All physical measurements are to some extent uncertain. The degree of precision is indicated by SIGNIFICANT FIGURES

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**Metric Conversion Challenge**

Write the correct abbreviation for each metric unit. 1) Kilogram _____ 4) Milliliter _____ 7) Kilometer _____ 2) Meter _____ 5) Millimeter _____ 8) Centimeter _____ 3) Gram _____ 6) Liter _____ 9) Milligram _____ Problems: How many milliliters are in a liter? 2) How many centimeters are in a meter? 3) How many kilometers are in a meter? 4) How many centimeters are in a kilometer? 5) How many kilometers are in a centimeter?

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**Try these conversions, using the ladder method.**

1) 1000 mg = _______ g 6) 1 L = _______ mL 11) 160 cm = _______ mm 2) 14 km = _______ m 7) 109 g = _______ kg 12) 250 m = _______ km

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**SI - length Meters 1 kilometer (km) = 1,000 meters (103)**

1 hectometer (hm) = 100 meters (102) 1 decameter (da) = 10 meters (101) 1 meter 10 decimeters (dm) = 1 meter (10-1) 100 centimeters (cm) = 1 meter (10-2) 1,000 millimeters (mm) = 1 meter (10-3)

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**SI - Mass Grams (usually in kg) 1 kilogram (kg) = 1,000 grams (103)**

1 hectogram (hg) = 100 grams (102) 1 decagram (dag) = 10 grams (101) 1 gram 10 decigram (dg) = 1 gram (10-1) 100 centigram (cg) = 1 gram (10-2) 1,000 milligram (mg) = 1 gram (10-3) (usually in kg)

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**SI - Volume Liters 1 kiloLiter (kL) = 1,000 liters (103)**

1 hectoLiter (hL) = 100 liters (102) 1 decaLiter (daL) = 10 liters (101) 1 Liter 10 deciLiter (dL) = 1 liters (10-1) 100 centiLiter (cL) = 1 liters (10-2) 1,000 milliLiter (mL) = 1 liters (10-3)

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**SI - Temperature 210 C = room temperature**

Celsius (0C) = 1000 C boiling water 00 C freezing water

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**Dimensional Analysis Given | needed| = | |**

| | Ex. Convert 10 meters into kilometers 10 meters is given Kilometers is needed 10 m | 1 km | = km = 0.01 km | 1,000 m | 1,000

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