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Metric History

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Metric Prefixes Teaching Prefixes Advantages of Metrics The meter is the length of the path travelled by light in a ... PowerPoint Presentation Author: eself ... – PowerPoint PPT presentation

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Title: Metric History


1
Metric History
2
Metric System
3
Confusing Measurements
4
French National Assembly Academy 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
Meter Stick
  • 1 meter 3.28 feet

12
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13
mm And cm
14
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15
Prefixes
16
Prefixes
  • Metric Prefixes can be used with any base unit.

17
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18
Metric Prefixes
19
Teaching Prefixes
Learn the 16 regular prefixes by counting Change
them by jumping the decimal point 3 places Dont
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
20
Advantages of Metrics
No conversions No fractions No numbers to
memorize No awkward rows of zeroes Complete Cohere
nt Unambiguous symbols Only 30 units The world
standard
21
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22
  • 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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