Definitions 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 Annex A of ISO 31-1 lists units of space and time based on the foot, pound, and second.

Annex B 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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ISO_31-1 - Photos and All Basic Informations

## ISO_31-1 More Links

Wikipedia:Citing SourcesWikipedia:VerifiabilityHelp:Introduction To Referencing With Wiki Markup/1Wikipedia:VerifiabilityHelp:Maintenance Template RemovalInternational StandardISO 31Physical QuantityPhysical UnitSpaceTimeISO 80000-3AngleRadianDegree (angle)ArcminuteArcsecondSolid AngleSteradianLengthMetreSpeed Of LightBreadthHeightRadiusDiameterLength Of PathDisplacement (vector)DistanceCartesian CoordinatesRadius Of Curvature (mathematics)CurvatureReciprocal MetreAreaSquare MetreHectareHectareVolumeCubic MetreLitreTimeTime IntervalSecondHyperfine LevelsGround StateCaesiumISO 8601MinuteHourDayAngular VelocityRadian Per SecondAngular AccelerationRadian Per Second SquaredVelocityMetre Per SecondKilometre Per HourAccelerationMetre Per Second SquaredAcceleration Of Free FallStandard GravityFoot (length)Pound (mass)SecondGrad (angle)Light YearAstronomical UnitParsecTropical YearGal (unit)Template:Time Measurement And StandardsTemplate Talk:Time Measurement And StandardsTimeTime StandardChronometryOrders Of Magnitude (time)MetrologyCoordinated Universal TimeUTC OffsetUniversal TimeΔTDUT1International Earth Rotation And Reference Systems ServiceISO 8601International Atomic TimeSix-hour Clock12-hour Clock24-hour ClockBarycentric Coordinate TimeBarycentric Dynamical TimeCivil TimeDaylight Saving TimeGeocentric Coordinate TimeInternational Date LineLeap SecondSolar TimeTerrestrial TimeTime Zone180th MeridianEphemeris TimeGreenwich Mean TimePrime MeridianTime In PhysicsAbsolute Time And SpaceSpacetimeChrononContinuous SignalCoordinate TimeCosmological DecadeDiscrete Time And Continuous TimePlanck TimeProper TimeTheory Of RelativityTime DilationGravitational Time DilationTime DomainTime Translation SymmetryT-symmetryHorologyClockAstrariumAtomic ClockComplication (horology)History Of Timekeeping DevicesHourglassMarine ChronometerMarine SandglassRadio ClockWatchWater ClockSundialDialing ScalesEquation Of TimeHistory Of SundialsSchema For Horizontal DialsCalendarAstronomical Year NumberingDominical LetterEpactEquinoxGregorian CalendarHebrew CalendarHindu CalendarIntercalation (timekeeping)Islamic CalendarJulian CalendarLeap YearLunar CalendarLunisolar CalendarSolar CalendarSolsticeTropical YearDetermination Of The Day Of The WeekNames Of The Days Of The WeekChronological DatingGeologic Time ScaleInternational Commission On StratigraphyAstronomical ChronologyGalactic YearNuclear TimescalePrecessionSidereal TimeUnit Of TimeFlick (time)Shake (unit)Jiffy (time)SecondMinuteMoment (time)HourDayWeekFortnightMonthYearOlympiadLustrumDecadeCenturySaeculumMillenniumChronologyDuration (philosophy)Duration (music)Mental ChronometryMetric TimeSystem TimeTime Value Of MoneyTimekeeperTemplate:ISO StandardsTemplate Talk:ISO StandardsInternational Organization For StandardizationList Of International Organization For Standardization StandardsList Of ISO RomanizationsList Of IEC StandardsISO 1ISO 2Preferred NumberISO 4ISO 5ISO 6ISO 7ISO 9A440 (pitch Standard)ISO 31ISO 31-0ISO 31-2ISO 31-3ISO 31-4ISO 31-5ISO 31-6ISO 31-7ISO 31-8ISO 31-9ISO 31-10ISO 31-11ISO 31-12ISO 31-13ISO 128ISO 216ISO 217ISO 226British Standard Pipe ThreadISO 233ISO 259EnvelopeKappa NumberVicat Softening PointISO 428ISO 518ISO 519ISO 639ISO 639-1ISO 639-2ISO 639-3ISO 639-5ISO 639-6ISO/IEC 646ISO 690ISO 732Antimagnetic WatchISO 843ISO 898ISO 965ISO 1000Magnetic Ink Character Recognition135 FilmOCR-A FontISO 1413ALGOL 60ISO 1745ISO 1989ISO 2014ISO 2015ISO/IEC 2022ISO 2047International Standard Book NumberISO 2145ISO 2146ISO 2240Water Resistant MarkISO 2709ISO 2711ISO 2788ISO 2848ISO 2852126 FilmISO 3103ISO 3166ISO 3166-1ISO 3166-2ISO 3166-3International Standard Serial NumberISO 3307Kunrei-shiki RomanizationISO 3864International Standard Recording CodeISO 3977ISO 4031ISO 4157ISO 4217ISO/IEC 4909ISO/IEC 5218ISO 5428ISO 5775ISO 5776ISO 5800ISO 5964ISO 6166ISO 6344ISO 6346ISO 6385Water Resistant MarkANSI Escape CodeISO 6438ISO 6523ISO 6709ISO 7001ISO 7002PinyinPascal (programming Language)ISO 7200OSI ModelISO 7736ISO/IEC 7810ISO/IEC 7811ISO/IEC 7812ISO/IEC 7813ISO/IEC 7816ISO 8000ISO 8178Fuel OilFTAMISO 8583ISO 8601Computer Graphics MetafileISO/IEC 8652ISO 8691Language Of Temporal Ordering SpecificationISO/IEC 8820-5ISO/IEC 8859ISO/IEC 8859-1ISO/IEC 8859-2ISO/IEC 8859-3ISO/IEC 8859-4ISO/IEC 8859-5ISO/IEC 8859-6ISO/IEC 8859-7ISO/IEC 8859-8ISO-8859-8-IISO/IEC 8859-9ISO/IEC 8859-10ISO/IEC 8859-11ISO/IEC 8859-12ISO/IEC 8859-13ISO/IEC 8859-14ISO/IEC 8859-15ISO/IEC 8859-16Standard Generalized Markup LanguageISO 9000SQLISO/IEC 9126File Allocation TableISO 9241ISO 9362Shoe SizeManufacturing Message SpecificationISO 9529ISO 9564X.500ISO 9660ISO 9897C (programming Language)POSIXISO 9984ISO 9985ISO/IEC 9995ISO 10005ISO 10006ISO 10007ISO/IEC 10116Whirlpool (cryptography)ISO 10160ISO 10161Guidelines For The Definition Of Managed ObjectsDocument Style Semantics And Specification LanguageISO 10206ISO 10218ISO 10303EXPRESS (data Modeling 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2000HTMLPDF417ISO/IEC 15504International Standard Identifier For Libraries And Related OrganizationsISO 15686ISO/IEC 15693International Standard Audiovisual NumberISO 15706-2International Standard Musical Work CodeISO 15897ISO 15919ISO 15924ISO 15926ISO 15926 WIPPDF/XMaxiCodeECMAScriptPDF/VTISO 16750ISO/TS 16949ISO/IEC 17024ISO/IEC 17025ISO 17100:2015Open Virtualization FormatSDMXLegal Entity IdentifierISO/IEC 27002ISO/IEC 18000QR CodeISO/IEC 18014ISO 18245Process Specification LanguagePhotographic Activity TestPDF/AISO 19011ISO 19092-1ISO 19092-2ISO 19114ISO 19115Simple Feature AccessISO 19136ISO 19439Common Object Request Broker ArchitectureUnified Modeling LanguageMeta-Object FacilityXML Metadata InterchangeUnified Modeling LanguageKnowledge Discovery MetamodelObject Constraint LanguageMeta-Object FacilityXML Metadata InterchangeBusiness Process Model And NotationISO 19600:2014ISO/IEC 19752RELAX NGISO/IEC 19770X3DISO/IEC 19794-5Cloud Infrastructure Management InterfaceISO/IEC 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