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HomePopularFrance Adopts Metric System

France Adopts Metric System

Units of measurement have been used since time immemorial. However, there were long-standing issues. 

For starters, it was common for different regions to use different units of measurement, which complicated trade as well as other interactions between them. Even with a strong central authority standardized units of measurement, the passage of time could undo its efforts, particularly if it weakened to the point of either negligibility or nonexistence. 

One of the biggest contributors to this problem was the fact that units of measurement were often based on something arbitrary. For example, the fathom was once based on the distance between the outstretched arms of a large man. Under these circumstances, it was no wonder that people started thinking about units of measurement based on something constant and invariant in the natural world that could be used on an international basis.

The French Revolution was a time of sweeping change. As a result, some of the revolutionary leaders used it as a chance to standardize their system for units of measurement. The French invited both Great Britain and the United States to participate in the project in 1790. However, when they were refused, they decided to go at it on their own. The new unit of length was the meter, which was set at one ten-millionth of the length of an Earth quadrant. 

Meanwhile, the new unit of mass was the kilogram, which was based on the mass of a cubic decimeter of water. In 1799, France adopted the metric system, which would lead to the International System of Units that exists in the present time.

Dorothy Smith
Dorothy’s friends call her the walking encyclopedia. She would be a great teammate for trivia! She volunteers at the local history museum as a welcome center greeter. Dorothy also leads the children’s book circle time at her neighborhood library.
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1 COMMENT

  1. One of the less well known – among the general public – ongoing changes
    in the metric system, is that many values that used to be measured values are now set by definition.

    For example, the speed of light is now 299792458 metres per second, BY DEFINITION!
    How can that be? Easy, there is a definition of a second, based on an emission frequency. And, eh voilà, a meter is defined as the distance light will travel in 1/ 299792458 of a second.

    In the last year or two, some additional values have been made fix by defnition.
    For example, Avogadro’s number (the number of atoms in a mole) has now been set by definition, such that weight of C12 in kilos (or grams) is set so that the weight of C12 * Avogadro’s number weighs exactly 1 gram (or kilo).

    Nils Andersson
    viking@codeart.com

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