Length Mass Time Temperature
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Transcript of Length Mass Time Temperature
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Length Mass Time Temperature
The four fundamental measurements most commonly used by humans are:
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circa 1300
The first official definitions of inch, foot and yard are established in England.
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1585Simon Stevin (born in Belgium in 1548) printed a book urging the adoption of a decimal system for coins, measures and weights.
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1670Gabriel Mouton (born in France in 1618) published a book describing a metric system of measurement.
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1790
The French Academy of Science defines the meter as one ten-millionth of the distance from Earth’s pole to the equator.
𝟏𝟏𝟎𝟎𝟎𝟎𝟎𝟎𝟎
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1792The US Mint produced the world’s first decimal currency, the dollar, which contained 100 cents.
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1795France became the first country to officially adopt the metric system.
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1866Congress passes a law recognizing, but not requiring, the metric system.
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1875The Treaty of the Meter was signed in Paris, France by 17 nations, including the USA.
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1889France sent to the USA prototypes of the meter and the kilogram to be used as standard measurements.
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1893By federal law, the USA changed fundamental standards of length and mass to metric standards.
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1960The General Conference on Weights and Measures adopted the name “System International” (“SI”) for the metric system and established rules for prefixes and the base units.
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1967The SI unit of time, the second, is changed to an atomic constant, instead of a reference to the Earth’s rotation.
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1983The SI unit of length, the meter, is changed to refer to the speed of light.
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1994Congress amends the Fair Packaging and Labeling Act to require metric units on most consumer products.
HOMEWORK ASSIGNMENT !
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2005
The SI unit of temperature, the Celsius degree, is changed to refer to an atomic constant.
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2014
The SI unit of mass, the gram, is expected to be changed to refer to an atomic constant.
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(Short) History of MeasurementHuman-centered (> 6,000 years)Earth-centered (~ 200 years)Universe-centered
time since 1967length since 1983temperature since 2005mass change pending