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  2. Millimetre - Wikipedia

    en.wikipedia.org/wiki/Millimetre

    Different lengths as in respect to the electromagnetic spectrum, measured by the metre and its derived scales.The microwave is between 1 meter to 1 millimeter.. The millimetre (international spelling; SI unit symbol mm) or millimeter (American spelling) is a unit of length in the International System of Units (SI), equal to one thousandth of a metre, which is the SI base unit of length.

  3. H0m gauge - Wikipedia

    en.wikipedia.org/wiki/H0m_gauge

    The H0m gauge is designed for the reproduction of narrow gauge railways with a prototype gauge of 850 to 1250 mm in H0 scale. The letter m stands for m etre prototype gauge with a track width of 1000 mm. It runs on 12 mm (0.472 in) TT scale tracks. Modern H0m trains run on realistic-looking two-rail track, which is powered by direct current ...

  4. Milliradian - Wikipedia

    en.wikipedia.org/wiki/Milliradian

    arcminutes. 54/5π⁠ ≈ 3.4377′. A milliradian (SI -symbol mrad, sometimes also abbreviated mil) is an SI derived unit for angular measurement which is defined as a thousandth of a radian (0.001 radian). Milliradians are used in adjustment of firearm sights by adjusting the angle of the sight compared to the barrel (up, down, left, or right).

  5. Orders of magnitude (length) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(length)

    The centimetre (SI symbol: cm) is a unit of length in the metric system equal to 10−2 metres (⁠ 1 100 ⁠ m = 0.01 m). To help compare different orders of magnitude, this section lists lengths between 10 −2 m and 10 −1 m (1 cm and 1 dm). 1 cm – 10 millimetres. 1 cm – 0.39 inches. 1 cm – edge of a square of area 1 cm 2.

  6. Metre-gauge railway - Wikipedia

    en.wikipedia.org/wiki/Metre-gauge_railway

    Metre-gauge railways (US: meter-gauge railways) are narrow-gauge railways with track gauge of 1,000 mm (3 ft3+3⁄8in) or 1 metre. [ 1 ] Metre gauge is used in around 95,000 kilometres (59,000 mi) of tracks around the world. [citation needed] It was used by several European colonial powers including France, Britain and Germany in their colonies.

  7. Metre-stick - Wikipedia

    en.wikipedia.org/wiki/Metre-stick

    Metre-stick. A metrestick divided into 1,000 mm and labeled with 100 cm. A metre-stick, metrestick (or meter-stick and meterstick as alternative spellings); [1] or yardstick[2] is either a straightedge or foldable ruler used to measure length, and is especially common in the construction industry. They are often made of wood or plastic, and ...

  8. List of track gauges - Wikipedia

    en.wikipedia.org/wiki/List_of_track_gauges

    The large network of narrow-gauge sugar cane light railways, almost all 610 mm (2 ft) gauge, is not shown, Rail gauge in Australia. Rail gauge world Track gauge Rail gauge world Map Rail gauge world Map, 600mm. to 1676 mm. Rail gauge world Map, 597 mm. to 2140 mm. Triple-gauge track on turntable, Gladstone, South Australia.

  9. Circular mil - Wikipedia

    en.wikipedia.org/wiki/Circular_mil

    A circular mil is a unit of area, equal to the area of a circle with a diameter of one mil (one thousandth of an inch or 0.0254 mm). It corresponds to approximately 5.067 × 10−4 mm2. It is a unit intended for referring to the area of a wire with a circular cross section. As the definition of the unit contains π, it is easy to calculate area ...