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Farad (F). The capacitance of a capacitor between the
plates of which there appears a difference of potential of 1 volt
when it is charged by a quantity of electricity equal to
I coulomb.
Foot (ft). The length equal to 0.304 8 metre exactly.
Gray (Gy). The energy imparied by ionizing radiation to a
mass of matter corresponding to 1 joule per kilogram.
Henry (H). The inductance of a closed circuit in which an
electromotive force of 1 volt is produced when the electric
current in the circuit varies uniformly at a rate of 1 ampere per
second.
Kelvin ( K ) . A unit of thermodynamic temperature which is
the fraction 1/273.16 of the thermodynamic temperature of
the triple point of water.
Kilogram (kg). The unit of mass equal to the mass of the
international prototype of the kilogram.
Knot (kt). The speed equal to 1 nautical mile per hour.
Litre (L). A unit of volume restricted to the measurement
of liquids and gases which is equal to 1 cubic decimetre.
Lumen (lm). The luminous flux emitted in a solid angle of
1 steradian by a point source having a uniform intensity of
1 candela.
Lux (Ix). The illuminance produced by a luminous flux of
1 lumen uniformly distributed ovei a surface of 1 square
metre.
Metre (m). The distance travelled by light in a vacuum
during 1/299 792 458 of a second.
Mole (mol). The amount of substance of a system which
contains as many elementary entities as there are atoms in
0.012 kilogram of carbon-12.
Note.- When the mole is used, the elementary entities
must be specifed and may be atoms, molecules, ions, electrons,
other particles or specified groups of such particles.
Nautical mile (NM). The length equal to 1 852 metres
exactly.
Newton (N). The force which, when applied to a body
having a mass of 1 kilogram gives it an acceleration of 1 metre
per second squared.
Ohm (R). The electric resistance between two points of a
conductor when a constant difference of potential of 1 volt,
applied between these two points, produces in this conductor
a current of 1 ampere, this conductor not being the source of
any electromotive force.
Hertz (Hz). The frequency of a periodic phenomenon of Pascal (Pa). The pressure or stress of 1 newton per square
which the period is 1 second. metre.
Joule ( J ) . The work done when the point of application of Radian (rad). The plane angle between two radii of a circle
a force of 1 newton is displaced a distance of I metre in the which cut off on the circumference an arc equal in length to
direction of the force. the radius.
ANNEX 5
Annex 5 - Units of Measurement to be used in Air
and Ground Operations
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 (S). The electric conductance of a conductor in
which a current of 1 ampere is produced by an electric
potential difference of 1 volt.
Sievert (Sv). The unit of radiation dose equivalent corresponding
to 1 joule per kilogram.
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.
I - 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.
Annex 5 - Units of Measurement to be used in Air
3 - Standard Application of Units of Measurement and Ground Operations
Table 3-3. Non-SI alternative units permitted for temporary use with the SI
Specifc quantities
in Table 3-4
related to
Unit Definition
(in terms of SI units)
distancc (long) nautical mile NM 1 NM=l 852 m
distance foot
(~ertical)~)
speed knot kt 1 kt = 0.514 444 m/s
a) altitude, elevation, height, vertical speed.
3.2.2 Non-SI alternative units permitted
for temporary use with the SI
The non-SI units listed in Table 3-3 shall be permitted for
temporary use as alternative units of measurement but only
　
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