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  2. Metrication in the United States - Wikipedia

    en.wikipedia.org/wiki/Metrication_in_the_United...

    A standard method for sizing tires combines millimeters for overall width and inches for the wheel diameter on which they fit. In lighting, light bulbs use eighths of an inch for bulb diameter and full inches for fluorescent tube lengths, while the socket is always in millimeters (for example, the standard "medium Edison screw" is E26).

  3. International System of Units - Wikipedia

    en.wikipedia.org/wiki/International_System_of_Units

    The conversion between different SI units for one and the same physical quantity is always through a power of ten. This is why the SI (and metric systems more generally) are called decimal systems of measurement units. The grouping formed by a prefix symbol attached to a unit symbol (e.g. ' km ', ' cm ') constitutes a new inseparable unit ...

  4. Metric system - Wikipedia

    en.wikipedia.org/wiki/Metric_system

    The metric system is a decimal -based system of measurement. The current international standard for the metric system is the International System of Units (Système international d'unités or SI), in which all units can be expressed in terms of seven base units: the metre, kilogram, second, ampere, kelvin, mole, and candela .

  5. Conversion of units - Wikipedia

    en.wikipedia.org/wiki/Conversion_of_units

    Conversion of units is the conversion of the unit of measurement in which a quantity is expressed, typically through a multiplicative conversion factor that changes the unit without changing the quantity. This is also often loosely taken to include replacement of a quantity with a corresponding quantity that describes the same physical property ...

  6. History of the metric system - Wikipedia

    en.wikipedia.org/wiki/History_of_the_metric_system

    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 ...

  7. German units of measurement - Wikipedia

    en.wikipedia.org/wiki/German_units_of_measurement

    A German geographic mile ( geographische Meile) is defined as 1⁄15 equatorial degrees, equal to 7,420.54 m (24,345.6 ft ). A common German mile, land mile, or post mile ( Gemeine deutsche Meile, Landmeile, Postmeile) was defined in various ways at different places and different times. After the introduction of the metric system in the 19th ...

  8. United States customary units - Wikipedia

    en.wikipedia.org/wiki/United_States_customary_units

    Bolts and screws follow the Unified Thread Standard rather than the ISO metric screw thread standard. Knitting needles in the United States are measured according to a non-linear unitless numerical system. Thickness of aluminum foil is measured in mils (1 ⁄ 1000 inch, or 0.0254 mm) in the United States.

  9. Metrication in Canada - Wikipedia

    en.wikipedia.org/wiki/Metrication_in_Canada

    The popular .30-30 Winchester is a 0.30-inch-calibre (7.62 mm) bullet originally loaded with 30 grains (1.9 g) of smokeless gunpowder. Print. Canada uses the inch-based paper standard e.g. the US Letter (8.5 inches × 11 inches), rather than the metric-based A4 paper size (210 mm ×

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