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In such applications it is useful to use a unit for target size that is a thousandth of the unit for range, for instance by using the metric units millimeters for target size and meters for range. This coincides with the definition of the milliradian where the arc length is defined as 1 / 1,000 of the radius.
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non-SI metric: tonne: t t 1.0 t (0.98 long tons; 1.1 short tons) t LT. t LT ST; t ST. t ST LT; metric ton: MT t MT LT. MT LT ST; MT ST. MT ST LT; Avoirdupois: long ton: LT (none) 2,240 lb used mostly in the British Commonwealth except Canada 1.0 long ton (1.0 t) LT t. LT t ST; LT MT. LT MT ST; LT ST. LT ST t; LT ST MT; short ton: ST (none ...
Conversions between units in the metric system are defined by their prefixes (for example, 1 kilogram = 1000 grams, 1 milligram = 0.001 grams) and are thus not listed in this article. Exceptions are made if the unit is commonly known by another name (for example, 1 micron = 10 −6 metre).
The atomic units have been chosen to use several constants relating to the electron: the electron mass, the elementary charge, the Coulomb constant and the reduced Planck constant. The unit of energy in this system is the total energy of the electron in the Bohr atom and called the Hartree energy. The unit of length is the Bohr radius.
Note that the m³ gas conversion factor takes into account a difference in the standard temperature base for measurement of gas volumes in metric and imperial units. The standard temperature for metric measurement is 15 degrees Celsius (i.e. 59 degrees Fahrenheit) while for English measurement the standard temperature is 60 °F.
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Conversion of various sight adjustment increment Increment, or click (mins of arc) (milli-radians) At 100 m At 100 yd ()()()()1 ⁄ 12 ′ : 0.083′ 0.024 mrad 2.42 mm