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Published byClyde Burke Modified over 8 years ago
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Confusing Measurements
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French National Assembly Academy of Sciences
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Metric System Insured worldwide standard
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Quadrant Surveyors JBJ Delambre PFA Mechain
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Measuring the Quadrant
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Early Researchers J.R. Benoit
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Excited Cadmium Atoms Wavelength
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Defined By Light
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Meter Stick 1 meter = 3.28 feet
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mm And cm
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tera- (T-)10 12 1 trillion giga- (G-)10 9 1 billion mega- (M-)10 6 1 million kilo- (k-)10 3 1 thousand hecto- (h-)10 2 1 hundred deka- (da-)**101 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
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Metric Prefixes can be used with any base unit.
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Metric Prefixes
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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
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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
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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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