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  2. System of units of measurement - Wikipedia

    en.wikipedia.org/wiki/System_of_units_of_measurement

    A baby bottle that measures in three measurement systems—metric, imperial (UK), and US customary. Metric systems of units have evolved since the adoption of the first well-defined system in France in 1795. During this evolution the use of these systems has spread throughout the world, first to non-English-speaking countries, and then to ...

  3. Imperial units - Wikipedia

    en.wikipedia.org/wiki/Imperial_units

    The former Weights and Measures office in Seven Sisters, London (590 Seven Sisters Road). The imperial system of units, imperial system or imperial units (also known as British Imperial [1] or Exchequer Standards of 1826) is the system of units first defined in the British Weights and Measures Act 1824 and continued to be developed through a series of Weights and Measures Acts and amendments.

  4. Metrication - Wikipedia

    en.wikipedia.org/wiki/Metrication

    Imperial: Metric Indeterminate Liberia [Note 6] United States customary units [124] Metric and Imperial. The Liberian government has begun transitioning from use of imperial units to the metric system. However, this change has been gradual, with government reports concurrently using both systems. [131] 2011 [Note 7] [132] 2013 [133] [134] Myanmar

  5. International System of Units - Wikipedia

    en.wikipedia.org/wiki/International_System_of_Units

    Countries using the metric (SI), imperial, and US customary systems as of 2019. The International System of Units, or SI, [1]: 123 is a decimal and metric system of units established in 1960 and periodically updated since then.

  6. History of the metric system - Wikipedia

    en.wikipedia.org/wiki/History_of_the_metric_system

    Units in everyday use by country as of 2019 The history of the metric system began during the Age of Enlightenment with measures of length and weight derived from nature, along with their decimal multiples and fractions. The system became the standard of France and Europe within half a century. Other measures with unity ratios [Note 1] were added, and the system went on to be adopted across ...

  7. Imperial and US customary measurement systems - Wikipedia

    en.wikipedia.org/wiki/Imperial_and_US_customary...

    Countries using the metric, imperial and US customary systems as of 2019. In the 1960s a metrication program was initiated in most English-speaking countries, resulting in either the partial or total displacement of the imperial system or the US customary system of measure in those countries.

  8. Metric system - Wikipedia

    en.wikipedia.org/wiki/Metric_system

    The SI system has been adopted as the official system of weights and measures by most countries in the world. A notable outlier is the United States (US). Although used in some contexts, the US has resisted full adoption; continuing to use "a conglomeration of basically incoherent measurement systems". [2]

  9. History of measurement - Wikipedia

    en.wikipedia.org/wiki/History_of_measurement

    Detail of a cubit rod in the Museo Egizio of Turin The earliest recorded systems of weights and measures originate in the 3rd or 4th millennium BC. Even the very earliest civilizations needed measurement for purposes of agriculture, construction and trade. Early standard units might only have applied to a single community or small region, with every area developing its own standards for ...