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Editorial Information
Quantity | Unit | ||
---|---|---|---|
Name | Symbol | Value | |
Vergency of optical systems | dioptre* | 1 dioptre = 1 m -1 | |
Mass of precious stones | metric carat | 1 metric carat = 2 × 10 -4 kg | |
Area of farmland and building land | are | a | 1 a = 10 2 m 2 |
Mass per unit length of textile yarns and threads | tex* | tex* | 1 tex = 10 -6 kg · m -1 |
[F1Blood pressure and pressure of other body fluids | Millimetre of mercury | mm Hg(*) | 1 mm Hg = 133,322 Pa |
Effective cross-sectional area | Barn | b | 1 b = 10 -28 m 2] |
[F2The prefixes and their symbols listed in 1.3 may be used in conjunction with the above units and symbols, with the exception of the millimetre of mercury and its symbol. The multiple of 10 2 a is, however, called a ‘ hectare ’ .] ] U.K.