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The Metric System

Metric mishap caused loss of NASA orbiter Orbiter NASA's Climate Orbiter was lost September 23, 1999 By Robin Lloyd CNN Interactive Senior Writer

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The Metric System

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  1. Metric mishap caused loss of NASA orbiter Orbiter NASA's Climate Orbiter was lost September 23, 1999 By Robin Lloyd CNN Interactive Senior Writer (CNN) -- NASA lost a $125 million Mars orbiter because a Lockheed Martin engineering team used English units of measurement while the agency's team used the more conventional metric system for a key spacecraft operation, according to a review finding released Thursday. The Metric System -why do we need to learn this?

  2. We use the “English” system

  3. English system • Only in the USA and Britain • No systematic approach • Based on body parts of the of royalty! And other Imperial connections….. • Units • Length = Inches (12 inches = length of King’s foot!!!) • Mass/Weight = Pounds • Volume = Gallons (Queen Anne’s wine gallons!)

  4. Metric or SI System • Almost every country except USA and Britain • Systematic approach • Based on 10’s • Units • Length = Meters • Mass/Weight = Grams • Volume = Liters • Time = Seconds • Temperature = celsius

  5. English system Boiling point 212°F Freezing point 32°F Metric System Boiling point 100°C Freezing point 0°C Temperature scale of water Celsius Fahrenheit

  6. English system Body Temp 98.9°F Metric System Body Temp 37°C Temperature scale Room temp: 25c

  7. Some conversion relationships for GRAMS: • 1g = 1000 mg can also be written as a fraction: 1000 mg 1 g • OR AS : 1 g 1000m g

  8. Example for Unit Conversions • 1Km = 1000m • 1Km = 100000cm • 1Km = 1000000mm • 1Km = 1000000000 mm • 1m = 100cm • 1m = 1000mm • 1m = 1000000 mm • 1cm = 10mm • 1cm = 10000mm • 1mm = 1000mm

  9. Practice these conversions • Ex. 1: Convert 46.5 mg to grams. 46.5 mg 1 g = 0.0465g 1000 mg

  10. Picket Fence Method for Metric Conversion Problems

  11. Practice these conversions • Ex. 1: Convert 125cm to Km. 125 cm 1 m 1Km 0.00125Km 100 cm 1000m

  12. You fill this like the above row! You fill this like the above row!

  13. Homework Help! • 11) 1 mL = 0.001L (see previous slide!) • 12) 5 cm = 50 mm • 13) 10 mg = 0.01 g (1 mg = 0.001 g) • 14) 39 m = 39000 mm • You figure out the rest!

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