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

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

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

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

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

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)

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

KILO 1000 Units HECTO 100 Units DEKA 10 Units DECI 0.1 Unit CENTI 0.01 Unit MILLI 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 How many jumps does it take? Starting Point Ending Point 4. 1 __. 2 3 = 4000 m

Try these conversions using the ladder method 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

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