Physical Units

CASA regonizes physical units as listed in the following Tables.

Prefix Name Value
Y (yotta) 1024
Z (zetta) 1021
E (exa) 1018
P (peta) 1015
T (tera) 1012
G (giga) 109
M (mega) 106
k (kilo) 103
h (hecto) 102
da (deka) 10
d (deci) 10−1
c (centi) 10−2
m (milli) 10−3
u (micro) 10−6
n (nano) 10−9
p (pico) 10−12
f (femto) 10−15
a (atto) 10−18
z (zepto) 10−21
y (yocto) 10−24
Type Table
ID reference-tab-prefix 
Caption

Physical units: Prefixes

  

Unit Name Value
$ (currency) 1 _
% (percent) 0.01
%% (permille) 0.001
A (ampere) 1 A
AE (astronomical unit) 149597870659 m
AU (astronomical unit) 149597870659 m
Bq (becquerel) 1 s−1
C (coulomb) 1 s A
F (farad) 1 m−2 kg−1 s4 A2
Gy (gray) 1 m2 s−2
H (henry) 1 m2 kg s−2 A−2
Hz (hertz) 1 s−1
J (joule) 1 m2 kg s−2
Jy (jansky) 10−26 kg s−2
K (kelvin) 1 K
L (litre) 0.001 m3
M0 (solar mass) 1.98891944407× 1030 kg
N (newton) 1 m kg s−2
Ohm (ohm) 1 m2 kg s−3 A−2
Pa (pascal) 1 m−1 kg s−2
S (siemens) 1 m−2 kg−1 s3 A2
S0 (solar mass) 1.98891944407× 1030 kg
Sv (sievert) 1 m2 s−2
T (tesla) 1 kg s−2 A−1
UA (astronomical unit) 149597870659 m
V (volt) 1 m2 kg s−3 A−1
W (watt) 1 m2 kg s−3
Wb (weber) 1 m2 kg s−2 A−1
_ (undimensioned) 1 _
a (year) 31557600 s
arcmin (arcmin) 0.000290888208666 rad
arcsec (arcsec) 4.8481368111×10−6 rad
as (arcsec) 4.8481368111e×10−6 rad
cd (candela) 1 cd
cy (century) 3155760000 s
d (day) 86400 s
deg (degree) 0.0174532925199 rad
g (gram) 0.001 kg
h (hour) 3600 s
l (litre) 0.001 m3
lm (lumen) 1 cd sr
lx (lux) 1 m−2 cd sr
m (metre) 1 m
min (minute) 60 s
mol (mole) 1 mol
pc (parsec) 3.08567758065×1016 m
rad (radian) 1 rad
s (second) 1 s
sr (steradian) 1 sr
t (tonne) 1000 kg
Type Table
ID reference-tab-physicalunits
Caption Physical SI Units

 

Unit Name Value
" (arcsec) 4.8481368111×10−6 rad
"_2 (square arcsec) 2.35044305391× 10−11 sr
’ (arcmin) 0.000290888208666 rad
” (arcsec) 4.8481368111×10−6 rad
”_2 (square arcsec) 2.35044305391×10−11 sr
’_2 (square arcmin) 8.46159499408×10−8 sr
: (hour) 3600 s
:: (minute) 60 s
::: (second) 1 s
Ah (ampere hour) 3600 s A
Angstrom (angstrom) 1e-10 m
Btu (British thermal unit (Int)) 1055.056 m2 kg s−2
CM (metric carat) 0.0002 kg
Cal (large calorie (Int)) 4186.8 m2 kg s−2
FU (flux unit) 10−26 kg s−2
G (gauss) 0.0001 kg s−2 A−1
Gal (gal) 0.01 m s−2
Gb (gilbert) 0.795774715459 A
Mx (maxwell) 10−8 m2 kg s−2 A−1
Oe (oersted) 79.5774715459 m−1 A
R (mile) 0.000258 kg−1 s A
St (stokes) 0.0001 m2 s−1
Torr (torr) 133.322368421 m−1 kg s−2
USfl_oz (fluid ounce (US)) 2.95735295625×10−5 m3
USgal (gallon (US)) 0.003785411784 m3
WU (WSRT flux unit) 5× 10−29 kg s−2
abA (abampere) 10 A
abC (abcoulomb) 10 s A
abF (abfarad) 109 m−2 kg−1 s4 A2
abH (abhenry) 10−9 m2 kg s−2 A−2
abOhm (abohm) 10−9 m2 kg s−3 A−2
abV (abvolt) 10−8 m2 kg s−3 A−1
ac (acre) 4046.8564224 m2
arcmin_2 (square arcmin) 8.46-2159499408×10−8 sr
arcsec_2 (square arcsec) 2.35044305391×10−11 sr
ata (technical atmosphere) 98066.5 m−1.kg.s−2
atm (standard atmosphere) 101325 m−1.kg.s−2
bar (bar) 100000 m−1.kg.s−2
beam (undefined beam area) 1 _
cal (calorie (Int)) 4.1868 m2 kg s−2
count (count) 1 _
cwt (hundredweight) 50.80234544 kg
deg_2 (square degree) 0.000304617419787 sr
dyn (dyne) 10−5 m kg s−2
eV (electron volt) 1.60217733×10−19 m2 kg s−2
erg (erg) 10−7 m2 kg s−2
fl_oz (fluid ounce (Imp)) 2.84130488996×10−5 m3
ft (foot) 0.3048 m
fu (flux unit) 10−26 kg s−2
fur (furlong) 201.168 m
gal (gallon (Imp)) 0.00454608782394 m3
ha (hectare) 10000 m2
hp (horsepower) 745.7 m2 kg s−3
in (inch) 0.0254 m
kn (knot (Imp)) 0.514773333333 m s−1
lambda (lambda) 1 _
lb (pound (avoirdupois)) 0.45359237 kg
ly (light year) 9.46073047×1015 m
mHg (metre of mercury) 133322.387415 m−1 kg s−2
mile (mile) 1609.344 m
n_mile (nautical mile (Imp)) 1853.184 m
oz (ounce (avoirdupois)) 0.028349523125 kg
pixel (pixel) 1 _
sb (stilb) 10000 m−2 cd
sq_arcmin (square arcmin) 8.46159499408×10−8 sr
sq_arcsec (square arcsec) 2.35044305391×10−11 sr
sq_deg (square degree) 0.000304617419787 sr
statA (statampere) 3.33564095198×10−10 A
statC (statcoulomb) 3.33564095198×10−10 s A
statF (statfarad) 1.11188031733×10−12 m−2 kg−1 s4 A2
statH (stathenry) 899377374000 m2 kg s−2 A−2
statOhm (statohm) 899377374000 m2 kg s−3 A−2
statV (statvolt) 299.792458 m2 kg s−3 A−1
u (atomic mass unit) 1.661×10−27  kg
yd (yard) 0.9144 m
yr (year) 31557600 s
Type Table
ID reference-tab-customunits
Caption Custom units available in CASA