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  2. Metrication in the United States - Wikipedia

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

    A shampoo label from the U.S. that shows a round metric quantity taking secondary status in parentheses next to non-integer U.S. customary quantity. Metrication (or metrification) is the process of introducing the International System of Units, also known as SI units or the metric system, to replace a jurisdiction's traditional measuring units.

  3. Vernier scale - Wikipedia

    en.wikipedia.org/wiki/Vernier_scale

    Vernier caliper with a vernier constant of 0.1 for clarity of operation. The standard for a caliper is usually a constant of 0.02 Vernier caliper scale with the normal 0.02 vernier constant, showing measurement of object at 19.44 mm to two decimal places

  4. 21 cm RK L/22 - Wikipedia

    en.wikipedia.org/wiki/21_cm_RK_L/22

    Muzzle velocity. 446 m/s. [ 4] Effective firing range. 6,000 m (20,000 ft) at 14.10° elevation [ 5] The 21 cm RK L/22 was a 21 cm caliber Krupp gun that was purposefully designed to use a combination of prismatic gunpowder, a built-up gun barrel, and the Krupp cylindroprismatic sliding breech with broadwell ring.

  5. Unit prefix - Wikipedia

    en.wikipedia.org/wiki/Unit_prefix

    The unit prefixes are always considered to be part of the unit, so that, e.g., in exponentiation, 1 km 2 means one square kilometre, not one thousand square metres, and 1 cm 3 means one cubic centimetre, not one hundredth of a cubic metre. In general, prefixes are used with any metric unit, but may also be used with non-metric units.

  6. Real-time kinematic positioning - Wikipedia

    en.wikipedia.org/wiki/Real-time_kinematic...

    This allows the units to calculate their relative position to within millimeters, although their absolute position is accurate only to the same accuracy as the computed position of the base station. For RTK with a single base station, accuracy of 8mm + 1ppm (parts per million / 1mm per km) horizontal and 15mm + 1ppm vertical relative to the ...

  7. Microwave - Wikipedia

    en.wikipedia.org/wiki/Microwave

    A recently [when?] completed microwave radio telescope is the Atacama Large Millimeter Array, located at more than 5,000 meters (16,597 ft) altitude in Chile, which observes the universe in the millimeter and submillimeter wavelength ranges. The world's largest ground-based astronomy project to date, it consists of more than 66 dishes and was ...

  8. Metrication in the United Kingdom - Wikipedia

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

    The report showed that 98.7% of 100,938 responses preferred the metric system; 17.6% wanted a purely metric system whereas 81.1% opted for the status quo (being as per the current legislation, which is imperial units can be displayed only as optional, less prevalent, supplementary units).

  9. Button cell - Wikipedia

    en.wikipedia.org/wiki/Button_cell

    A button cell, watch battery, or coin battery is a small battery made of a single electrochemical cell and shaped as a squat cylinder typically 5 to 25 mm (0.197 to 0.984 in) in diameter and 1 to 6 mm (0.039 to 0.236 in) high – resembling a button. Stainless steel usually forms the bottom body and positive terminal of the cell; insulated from ...