Company Writer's Guide
[For Illustration Only] B-16
Symbols for Units in General Use (Cont’d)
Unit Symbol Notes
square foot ft
2
square inch in
2
square meter m
2
square meter per second m
2
/s SI unit of kinematic viscosity.
square millimeter per second mm
2
/s SI unit-multiple of kinematic viscosity.
square yard yd
2
steradian sr SI unit of solid angle.
stilb sb 1 sb = 1 cd/cm
2
A CGS unit of luminance. Deprecated
(see ANSI Z210.1-1976).
stokes St Deprecated (see ANSI Z210.1-1976).
tera T SI prefix for 10
12
.
tesla T
1 T = 1 N/(A•m) = 1 Wb/m
2
. SI unit of magnetic
flux density (magnetic reduction).
therm thm 1 thm = 100,000 Btu
ton (short) ton 1 ton = 2000 lb
ton, metric t
1 t = 1000 kg. The name tonne is used in some
countries for this unit, but use of this name in the
USA is deprecated (see ANSI Z210.1-1976).
(unified) atomic mass unit 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.
var var
IEC name and symbol for the SI unit of reactive
power.
volt V SI unit of voltage.
volt per meter V/m SI unit of electric field strength.
