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Unformatted text preview: onductors of
infinite length, of negligible circular cross section, and
placed one meter apart in vacuum, would produce
between these conductors a force equal to 2 x 10
newton per meter of length.
candela (cd) The candela is the luminous intensity, in a
given direction, of a source that emits monochromatic
radiation of frequency 540 x 10 Hz and that has a
radiant intensity in that direction of 1/683 watt per
kelvin (K) The kelvin, unit of thermodynamic temperature, is the fraction 1/273.16 of the thermodynamic temperature of the triple point of water. NASA Systems Engineering Handbook
kilogram (kg) The kilogram is the unit of mass; it is
equal to the mass of the international prototype of the
kilogram. (The international prototype of the kilogram is
a particular cylinder of platinum-iridium alloy which is
preserved in a vault at Sevres, France, by the
International Bureau of Weights and Measures.)
meter (m) The meter is the length of the path traveled
by light in a vacuum during a time interval of 1 299 792
458 of a second.
mole (mol) The mole is 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
specified and may be atoms, molecules, ions, electrons,
other particles, or specified groups of such particles.
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 cesium-133 atom.
C.2.3 Supplementary SI Units difference of potential of one volt when it is charged by
a quantity of electricity equal to one coulomb.
gray (Gy = J/kg) The gray is the absorbed dose when
the energy per unit mass imparted to matter by ionizing
radiation is one joule per kilogram. (The gray is also
used for the ionizing radiation quantities: specific energy
imparted, kerma, and absorbed dose index.)
henry (H = Wb/A) The henry is the inductan...
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