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Roentgen (R). A unit of radiation exposure equal to
2.58 x 10-4coulomb per kilogram.
Second (s). 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.
Siemens 6).T he electric conductance of a conductor in
which a current of 1 ampere is produced by an electric
potential difference of 1 volt.
Steradian (sr). The solid angle which, having its vertex in
the centre of a sphere, cuts off an area of the surface of the
sphere equal to that of a square with sides of length equal to
the radius of the sphere.
1 - Definitions
Tesla (T). The magnetic flux density given by a magnetic
flux of 1 weber per square metre.
Tonne (t). The mass equal to 1 000 kilograms
Volt (V). The unit of electric potential difference and
electromotive force which is the difference of electric
potential between two points of a conductor carrying a
constant current of 1 ampere, when the power dissipated
between these points is equal to 1 watt.
Watt (W). The power which gives rise to the production
of energy at the rate of 1 joule per second.
Weber (Wb). The magnetic flux which, linking a circuit
of one turn, produces in it an electromotive force of 1 volt as
it is reduced to zero at a uniform rate in I second.
CHAPTER 2.-APPLICABILITY
Introductory Note. -This Annex contains specifications for the use of a
standardized system of units of measurement in international civil aviation air
and ground operations. This standardized system of units of measurement is
based on the International System of Units (SI) and certain non-SI units
considered necessary to meet the specialized requirements of international civil
aviation. See Attachment A for details concerning the development of the SI.
The Standards contained in this Annex shall be applicable to all
aspects of international civil aviation air and ground operations.
ANNEX 5
CHAPTER 3.--STANDARD APPLICATION OF UNITS OF MEASUREMENT
3.1.CI Units
3.1.1 The International System of Units developed
and maintained by the General Conference of Weights and
Measures (CGPM) shall, subject to the provisions of 3.2 and
3.3, be used as the standard system of units of measurement
for all aspects of international civil aviation air and ground
operations.
The prefixes and symbols listed in Table 3-1 shall be used
to form names and symbols of the decimal multiples and
sub-multiples of SI units.
Note 1. -As used herein the term SI unit is meant to include
base units and derived units as well as their multiples and submultiples.
Note 2. -See Attachment B ,for guidance on the general
application of prefixes.
3.2.4on-SI Units
3.2.1.-Non-SI units for permanent use with the SI
The non-SI units listed in Table 3-2 shall be used either in
lieu of, or in addition to, SI units as primary units of
measurement but only as specified in Table 3-4.
Table 3-1. -SI unit prefixes
Multiplication factor Prefix Symbol
1 000 000 000 000 000 000 = 10'~ exa E
1 000 000 000 000 000 = 10" peta P
1 000 000 000 000 = 10" tera T
1 000 000 000 = lo9 giga G
1 000 000 = lo6 mega M
1 000 = lo3 kilo k
100 = 10' hecto h
10 = 10' deca da
0.1 = lo-' deci d
0.01 = lo-' centi c
0.001 = milli m
0.000 001 = lov6 micro p
0.000 000 001 = nano n
0.000 000 000 001 = 1 0-" pic0 P
0.000 000 000 000 001 = lo-'' femto f
0.000 000 000 000 000 001 = 10-l~ atto a
Table 3-2.-Non-SI units for permanent use with the SI
Specific quantities
in Table 3-4
related to
Unit Symbol Definition
(in terms of SI units)
mass tonne t 1 t=103 kg
plane angle degree
minute
second
0 lo = (1~1180r)a d
I 1' = (1/60)O= (=/lo 800) rad
' I 1" = (1160)' = (1~16480 00) rad
temperature degree Celsius O c 1 unit O c = 1 unit KB)
time minute min 1minZ60s
hour h lh=60min=3600s
day d 1d=24h=86400s
week, month, year -
volume litre L 1 L= 1 dm3 = 1W3m3
a) See Alkichmenl C, Table C-2 lor conversion.
2611 1/81 10 ANNEX 5
3 - Standard Application of Units ofMeasurement
Anna 5 - Units of Measurement to be used in Air
and Ground Operations
Table 3-3.-Non-SI alternative units permitted for temporary use with the SI
Specific quantities
in Table 3-4
related to
Unit Symbol Definition
(in terms of SI units)
absorbed dose rad
(radiation)
activity curie
(radionuclides)
distance (long) nautical mile NM lNM=1852m
distance foot
(verticalla)
　
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