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Equatorial diameter of Earth 20.004 Mm ... viruses range in size from 20 nm to 450 nm ... typical school-use ruler length (= 300 mm) 30.48 cm = 3.048 dm ...
The usual nomenclature of ammunition indicates the diameter of projectile and the length of the cartridge that holds it; for example, 20×102 mm is a 20 mm projectile in a 102 mm long case. Though this designation is often assumed to be unique, this is not always the case, e.g. there are three different 20×110 mm types which are not compatible.
A common adjustment value in firearm sights is 1 cm at 100 meters which equals 10 mm / 100 m = 1 / 10 mrad. The true definition of a milliradian is based on a unit circle with a radius of one and an arc divided into 1,000 mrad per radian, hence 2,000 π or approximately 6,283.185 milliradians in one turn , and rifle scope ...
Length (system unit unit-code symbol or abbrev. notes sample default conversion combination output units SI: megametre: Mm Mm US spelling: megameter 1.0 Mm (620 mi) kilometre
Calibers fall into four general categories by size: [citation needed] miniature-bore historically refers to calibers with a diameter of 0.22 inches (5.6 mm) or smaller; small-bore refers to calibers with a diameter of 0.32 inches (8.1 mm) or smaller; medium-bore refers to calibers with a diameter of 0.33 inches (8.4 mm) to 0.39 inches (9.9 mm)
Diameter (mm) Weapon name Country of origin Period 20 mm (0.79 in) Breda Model 35 Kingdom of Italy: World War II 20 mm (0.79 in) Madsen 20 mm cannon Denmark: World War II 20 mm (0.79 in) 20 mm Oerlikon Switzerland: World War II - Cold War 20 mm (0.79 in) 20 mm Polsten Poland: World War II - Cold War 20 mm (0.79 in) 2 cm/65 C/30 Nazi Germany
A ruler, depicting two customary units of length, the centimeter and the inch. A unit of length refers to any arbitrarily chosen and accepted reference standard for measurement of length. The most common units in modern use are the metric units, used in every country globally. In the United States the U.S. customary units are also in use.
An Olympic-size swimming pool holds over 2 acre-feet of water For larger volumes of liquid, one measure commonly used in the media in many countries is the Olympic-size swimming pool. [47] A 50 m × 25 m (164 ft × 82 ft) Olympic swimming pool, built to the FR3 minimum depth of 2 metres (6.6 ft) would hold 2,500 m 3 (660,000 US gal).