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By Tens and Tenths

By Tens and Tenths. Metric Measurement Hannah Stevens. Earliest Standards. Span, palm, digit, foot King Henry I: yard Bishop Charles Maurice de Talleyrand 1790: swinging pendulum French Academy of Sciences Meridian arc. Metric Prefixes. Greek gigameter = 1,000,000,000 meters

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By Tens and Tenths

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  1. By Tens and Tenths Metric Measurement Hannah Stevens

  2. Earliest Standards • Span, palm, digit, foot • King Henry I: yard • Bishop Charles Maurice de Talleyrand • 1790: swinging pendulum • French Academy of Sciences • Meridian arc

  3. Metric Prefixes • Greek • gigameter = 1,000,000,000 meters • megameter = 1,000,000 meters • kilometer = 1000 meters • hectometer = 100 meters • decameter = 10 meters • meter = 1 meter • Latin • decimeter = .1 meter • centimeter = .01 meters • millimeter = .001 meters • micrometer = .000001 meters • nanometer = .000000001 meters

  4. The System • Design • Kilogram = liter • Grade vs. Radian • a = s/r • 1875: Treaty of the Meter

  5. International System of Units (SI) • Length meter m • Mass kilogram kg • Time second s • Electric current ampere A • Thermodynamic Kelvin K temperature • Amount of mole mol substance • Luminous intensity candela cd

  6. The Meter Redefined • 1960 • 1,650,763.73 x wavelength from krypton-86 • 1983 • Distance light travels in a vacuum in 1/299,792,458 of a second

  7. Metrics in the US • 1866 law legalizes use • Treaty of the Meter • Metric Conversion Act of 1975 • Other countries: • Liberia • Myanmar

  8. Conversions • 1 US gallon = 3.79 liters • 1 US quart = 0.95 liters • 1 US pound = 0.45 kilograms • To convert temperature: • Celsius = (5/9)*(Fahrenheit – 32) • Metric mile = 1.5 kilometers

  9. Sources • Berlinghoff, William P. and Fernando Q. Gouvea. Math Through the Ages: A Gentle History for Teachers and Others. Farmington, ME: Oxford House Publishers, 2002. • International System of Units from NIST. October 2000. NIST. 27 Jan 2007 http://physics.nist.gov/cuu/Units/index.html.

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