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Metric History

Metric History. Metric System. Confusing Measurements. French National Assembly Academy of Sciences. Metric System. Insured worldwide standard. Quadrant Surveyors. PFA Mechain. JBJ Delambre. Measuring the Quadrant. Early Researchers. J.R. Benoit.

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Metric History

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  1. Metric History

  2. Metric System

  3. Confusing Measurements

  4. French National AssemblyAcademy of Sciences

  5. Metric System • Insured worldwide standard

  6. Quadrant Surveyors PFA Mechain JBJ Delambre

  7. Measuring the Quadrant

  8. Early Researchers J.R. Benoit

  9. Excited Cadmium Atoms Wavelength

  10. Defined By Light

  11. 1 meter = 3.28 feet Meter Stick

  12. mm And cm

  13. tera- (T-) 1012 1 trillion giga- (G-) 109 1 billion mega- (M-) 106 1 million kilo- (k-) 103 1 thousand hecto- (h-) 102 1 hundred deka- (da-)** 10 1 ten deci- (d-) 10-1 1 tenth centi- (c-) 10-2 1 hundredth milli- (m-) 10-3 1 thousandth micro- (µ-) 10-6 1 millionth nano- (n-) 10-9 1 billionth Prefixes

  14. Prefixes • Metric Prefixes can be used with any base unit.

  15. Metric Prefixes

  16. Teaching Prefixes Learn the 16 regular prefixes by counting Change them by jumping the decimal point 3 places Don’t call this “converting units” Set calculator display to ENG Avoid the irregular prefixes (h, da, d, c) except in cm, cm2, cm3, dm3, hm2, hm3

  17. Advantages of Metrics No conversions No fractions No numbers to memorize No awkward rows of zeroes Complete Coherent Unambiguous symbols Only 30 units The world standard

  18. The meter is the length of the path travelled by light in a vacuum during a time interval of 1/299 792 458 of a second. (1983)

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