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ISO 31-1 - Wikipedia Jump to content

ISO 31-1

From Wikipedia, the free encyclopedia

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 It was superseded in 2006 by ISO 80000-3 .

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  m 2 m 2 = 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 ?
curvature ? reciprocal metre m ?1
area A square metre m 2 The units are (1 a = 100 m 2 ) and hectare (1 ha = 100 a) are used for agrarian areas.
volume V cubic metre m 3
litre L, l 1 L = 1 dm 3 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= dt
angular acceleration α radian per second squared rad s 2 α= 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 s 2 g = 9.80665  m s 2
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 .

References [ edit ]

  1. ^ "ISO 31-1:1992" . ISO . Retrieved 2023-02-07 .


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