Definitions[edit] 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 ϰ=​1⁄ϱ 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 = 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[edit] Annex A of ISO 31-1 lists units of space and time based on the foot, pound, and second.


Annex B[edit] Annex B lists some other non-SI units of space and time, namely the gon, light year, astronomical unit, parsec, tropical year, and gal. v t e Time measurement and standards Chronometry Orders of magnitude Metrology International standards Coordinated Universal Time offset UT ΔT DUT1 International Earth Rotation and Reference Systems Service ISO 31-1 ISO 8601 International Atomic Time 6-hour clock 12-hour clock 24-hour clock Barycentric Coordinate Time Barycentric Dynamical Time Civil time Daylight saving time Geocentric Coordinate Time International Date Line Leap second Solar time Terrestrial Time Time zone 180th meridian Obsolete standards Ephemeris time Greenwich Mean Time Prime meridian Time in physics Absolute time and space Spacetime Chronon Continuous signal Coordinate time Cosmological decade Discrete time and continuous time Planck time Proper time Theory of relativity Time dilation Gravitational time dilation Time domain Time translation symmetry T-symmetry Horology Clock Astrarium Atomic clock Complication History of timekeeping devices Hourglass Marine chronometer Marine sandglass Radio clock Watch Water clock Sundial Dialing scales Equation of time History of sundials Sundial markup schema Calendar Astronomical Dominical letter Epact Equinox Gregorian Hebrew Hindu Intercalation Islamic Julian Leap year Lunar Lunisolar Solar Solstice Tropical year Weekday determination Weekday names Archaeology and geology Chronological dating Geologic time scale International Commission on Stratigraphy Astronomical chronology Galactic year Nuclear timescale Precession Sidereal time Other units of time Flick Shake Jiffy Second Minute Moment Hour Day Week Fortnight Month Year Olympiad Lustrum Decade Century Saeculum Millennium Related topics Chronology Duration music Mental chronometry Metric time System time Time value of money Timekeeper v t e ISO standards by standard number List of ISO standards / ISO romanizations / IEC standards 1–9999 1 2 3 4 5 6 7 9 16 31 -0 -1 -2 -3 -4 -5 -6 -7 -8 -9 -10 -11 -12 -13 128 216 217 226 228 233 259 269 302 306 428 518 519 639 -1 -2 -3 -5 -6 646 690 732 764 843 898 965 1000 1004 1007 1073-1 1413 1538 1745 1989 2014 2015 2022 2047 2108 2145 2146 2240 2281 2709 2711 2788 2848 2852 3029 3103 3166 -1 -2 -3 3297 3307 3602 3864 3901 3977 4031 4157 4217 4909 5218 5428 5775 5776 5800 5964 6166 6344 6346 6385 6425 6429 6438 6523 6709 7001 7002 7098 7185 7200 7498 7736 7810 7811 7812 7813 7816 8000 8178 8217 8571 8583 8601 8632 8652 8691 8807 8820-5 8859 -1 -2 -3 -4 -5 -6 -7 -8 -8-I -9 -10 -11 -12 -13 -14 -15 -16 8879 9000/9001 9075 9126 9293 9241 9362 9407 9506 9529 9564 9594 9660 9897 9899 9945 9984 9985 9995 10000–19999 10005 10006 10007 10116 10118-3 10160 10161 10165 10179 10206 10218 10303 -11 -21 -22 -28 -238 10383 10487 10585 10589 10646 10664 10746 10861 10957 10962 10967 11073 11170 11179 11404 11544 11783 11784 11785 11801 11898 11940 (-2) 11941 11941 (TR) 11992 12006 12182 12207 12234-2 13211 -1 -2 13216 13250 13399 13406-2 13450 13485 13490 13567 13568 13584 13616 14000 14031 14224 14289 14396 14443 14496 -2 -3 -6 -10 -11 -12 -14 -17 -20 14644 14649 14651 14698 14750 14764 14882 14971 15022 15189 15288 15291 15292 15398 15408 15444 -3 15445 15438 15504 15511 15686 15693 15706 -2 15707 15897 15919 15924 15926 15926 WIP 15930 16023 16262 16612-2 16750 16949 (TS) 17024 17025 17100 17203 17369 17442 17799 18000 18004 18014 18245 18629 18916 19005 19011 19092 (-1 -2) 19114 19115 19125 19136 19439 19500 19501 19502 19503 19505 19506 19507 19508 19509 19510 19600:2014 19752 19757 19770 19775-1 19794-5 19831 20000+ 20000 20022 20121 20400 21000 21047 21500 21827:2002 22000 23270 23271 23360 24517 24613 24617 24707 25178 25964 26000 26300 26324 27000 series 27000 27001 27002 27006 27729 28000 29110 29148 29199-2 29500 30170 31000 32000 38500 40500 42010 55000 80000 -1 -2 -3 Category This standards- or measurement-related article is a stub. You can help Wikipedia by expanding it. v t e Retrieved from "https://en.wikipedia.org/w/index.php?title=ISO_31-1&oldid=649617449" Categories: Standards and measurement stubsSystems of unitsISO 31Hidden categories: Use British English Oxford spelling from January 2012Articles lacking sources from December 2009All articles lacking sourcesAll stub articles


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