Units#
The xara.units submodule contains predefined constants that can help with keeping track of units. Each submodule exports the following symbols:
Systems#
The idiom for importing constants from a system takes the form:
from xara.units.<system> import <symbols>...
where <system>
is one of the implemented systems.
For example, to import the symbols inch
and kip
from the iks
system,
from xara.units.iks import inch, kip, iks
Occasionally it is convenient to import all symbols using a star-import
from xara.units.iks import *
Note, however, that this is generally considered bad programming style.
Symbols#
Length#
mm |
millimeter |
Milimeter |
cm |
centimeter |
Centimeter |
m |
meter |
Meter |
km |
kilometer |
Kilometer |
inch |
||
ft |
foot |
International foot |
yd |
yard |
International yard |
mi |
mile |
Mile |
Force#
N |
newton |
Newton (force) |
dyn |
dyne |
Dyne |
pdl |
poundal |
Poundal |
lbf |
poundf |
|
kip |
klbf |
Mass#
slug |
||
lbm |
lbm |
International avoirdupois pound |
gm |
gram |
|
kg |
kilogram |
Kilogram |
tonne |
Metric tonne |
|
oz |
ounce |
International avoirdupois ounce |
Pressure#
Pa |
pascal |
Pascal |
torr |
||
kPa |
kilopascal |
|
bar |
||
atm |
atmosphere |
Standard atmosphere |
MPa |
megapascal |
|
GPa |
gigapascal |
|
psi |
Pound-square-inch |
|
ksi |
||
pci |
||
pcf |
Pounds per cubic foot |
Area#
mm2 |
Square millimeter |
|
m2 |
Square meter |
|
cm2 |
Square centimeter |
|
km2 |
Square kilometer |
|
in2 |
inch2 |
Square inch |
ft2 |
feet2 |
Square foot |
yd2 |
yard2 |
Square yard |
mi2 |
mile2 |
Square mile |
Volume#
mm3 |
||
m3 |
||
cm3 |
||
km3 |
||
in3 |
inch3 |
|
ft3 |
foot3 |
|
cyd |
yard3 |
|
mi3 |
mile3 |
Velocity#
mmps |
Millimeter per second |
|
cps |
cmps |
Centimeter per second |
mps |
Meter per second |
|
kps |
Kilometer per second |
|
ips |
inchps |
Inch per second |
fps |
footps |
Foot per second |
yps |
Yard per second |
|
mph |
mile per hour |
Acceleration#
mmps2 |
||
cps2 |
cmps2 |
|
mps2 |
||
kps2 |
||
ips2 |
inchps2 |
|
fps2 |
footps2 |
|
yps2 |
||
mph2 |
||
gravity |
Standard gravity |
Angular Velocity#
rpm |
revpm |
Revolution per minute |
radps |
Radian per second |