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ISO 31-1 [1] is the part of international standard ISO 31 that defines names and symbols for quantities and units related to space and time . It was superseded in 2006 by ISO 80000-3.
Its definitions include:
| Quantity | Unit | Remarks | |||
|---|---|---|---|---|---|
| Name | Symbol | Name | Symbol | Definition | |
| angle, (plane angle) | α, β, γ, θ, φ | radian | rad | 1 rad = 1 m⁄m = 1 | |
| degree | ° | 1° = π⁄180 rad | There is no space between the number and these superscript-style unit symbols. Decimal subdivision of degrees is preferable (i.e., 12.5° instead of 12°30′) | ||
| minute | ′ | 1′ = (1⁄60)° | |||
| second | ″ | 1″ = (1⁄60)′ | |||
| solid angle | Ω | steradian | sr | 1 sr = 1 m2⁄m2 = 1 | |
| length | l, L | metre | m | The metre is the length of the path travelled by light in vacuum during a time interval of 1⁄299 792 458 of a second; see speed of light | |
| breadth | b | ||||
| height | h | ||||
| thickness | d, δ | ||||
| radius | r, R | ||||
| diameter | d, D | ||||
| length of path, (linear) displacement vector | s, s | ||||
| distance | d, r | ||||
| cartesian coordinates | x, y, z | ||||
| radius of curvature | ϱ | ||||
| curvature | ϰ | reciprocal metre | m−1 | ||
| area | A | square metre | m2 | The units are (1 a = 100 m2) and hectare (1 ha = 100 a) are used for agrarian areas. | |
| volume | V | cubic metre | m3 | ||
| litre | L, l | 1 L = 1 dm3 | The capital L is preferred as the small l can be indistinguishable from the number 1 in some fonts. | ||
| time, time interval, duration | t | second | s | The second is the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom | Representations of time of day are defined in ISO 8601. |
| minute | min | 1 min = 60 s | |||
| hour | h | 1 h = 60 min = 3 600 s | |||
| day | d | 1 d = 24 h = 1 440 min = 86 400 s | |||
| angular velocity | ω | radian per second | rad⁄s | ω=dφ⁄dt | |
| angular acceleration | α | radian per second squared | rad⁄s2 | α=dω⁄dt | |
| velocity | v (general symbol), v (velocity vector), c (propagation speed of waves), u, v, w (components of a velocity c) | metre per second | m⁄s | ||
| kilometre per hour | km⁄h | ||||
| acceleration, acceleration vector | a, a | metre per second squared | m⁄s2 | 1 g = 9.80665 m⁄s2 | |
| acceleration of free fall, acceleration due to gravity | g | ||||
Annex A of ISO 31-1 lists units of space and time based on the foot, pound, and second.
Annex B lists some other non-SI units of space and time, namely the gon, light year, astronomical unit, parsec, tropical year, and gal.
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ISO 8601 is an international standard covering the worldwide exchange and communication of date and time-related data. It is maintained by the Geneva-based International Organization for Standardization (ISO) and was first published in 1988, with updates in 1991, 2000, 2004, and 2019, and an amendment in 2022. The standard provides a well-defined, unambiguous method of representing calendar dates and times in worldwide communications, especially to avoid misinterpreting numeric dates and times when such data is transferred between countries with different conventions for writing numeric dates and times.
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ISO 31 is a superseded international standard concerning physical quantities, units of measurement, their interrelationships and their presentation. It was revised and replaced by ISO/IEC 80000.
Nomenclature of Territorial Units for Statistics or NUTS is a geocode standard for referencing the administrative divisions of countries for statistical purposes. The standard, adopted in 2003, is developed and regulated by the European Union, and thus only covers the EU member states in detail. The Nomenclature of Territorial Units for Statistics is instrumental in the European Union's Structural Funds and Cohesion Fund delivery mechanisms and for locating the area where goods and services subject to European public procurement legislation are to be delivered.
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| Obsolete standards | ||
| Time in physics | ||
| Horology | ||
| Calendar | ||
| Archaeology and geology | ||
| Astronomical chronology | ||
| Other units of time | ||
| Related topics | ||
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