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Units of Measurement SI – Le Systeme International d’Unites AKA: the Metrics System

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SI Base Units Adopted: 1960 Standard international measurement Powers of Ten

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Mass vs. Weight Mass measures the quantity of matter Standard unit = g (gram) Instrument = Balance Weight measures the gravitational pull on matter Standard unit = N Newton is force Instrument = Spring Scale

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Length Distance measurement Standard unit = m (meter) Instrument = Ruler

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Volume Amount of space occupied by an object For non-liquid volumes, standard unit = m 3 For liquid volumes, standard unit = L (liter) 1 mL = 1 cm 3 Instrument = graduated cylinders or ruler

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Temperature Standard unit = Celsius Using Celsius, water freezes at 0 degrees, and boils at 100 degrees F = 9/5C + 32 C = 5/9 (F – 32)

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Conversions and Scale Larger ---------------------- Smaller (k) kilo (h) hecto (da) deca (d) deci (c) centi (m) milli Length kmhmdammdmcmmm Mass kghgdaggdgcgmg Liquid Volume kLhLdaLLdLcLmL

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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

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Try these conversions using the ladder method. 1000 mg = _______ g 1 L = _______ mL160 cm = _______ mm 14 km = _______ m109 g = _______ kg 250 m = _______ km Conversion Practice Compare using, or =. 56 cm 6 m 7 g 698 mg

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Compare using, or =. 25) 63 cm 6 m 27) 5 g 508 mg 29) 1,500 mL 1.5 L 26) 536 cm 53.6 dm 28) 43 mg 5 g 30) 3.6 m 36 cm

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