July 2002
Intermediate to advanced
344 pages
8h 37m
English
Content preview from Newnes Radio and RF Engineering Pocket Book, 3rd Edition
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313
25.2 Letter symbols by unit name
Unit Symbol Notes
ampere A SI unit of electric current.
ampere (turn) At SI unit of magnetomotive
force.
ampere-hour Ah
ampere per metre A m
−1
SI unit of magnetic field
strength.
angstrom
˚
A1
˚
A = 10
−10
m.
apostilb asb 1 asb(1/π)cd m
−2
A unit of
luminance. The SI unit,
candela per square metre,
is preferred.
atmosphere:
standard atm 1 atm = 101 325 N m
−2
.
atmosphere
technical at 1 at = 1 kgf cm
−2
.
atmosphere
atomic mass unit
(unified)
u The (unified) atomic mass
unit is defined as
one-twelfth of the mass of
an atom of the
12
C nuclide.
Use of the old atomic mass
unit (amu), defined by
reference to oxygen, is
deprecated.
bam b 1 b10
−28
m
2
.
bar bar ...
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