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Physical Units

esys.escript provides support for physical units in the SI system including unit conversion. So the user can define variables in the form
$\begin{python} from esys.escript.unitsSI import * l=20*m w=30*kg w2=40*lb T=100*Celsius \end{python}$
In the two latter cases an conversion from pounds and degree Celsius is performed into the appropriate SI units kg and Kelvin is performed. In addition composed units can be used, for instance
$\begin{python} from esys.escript.unitsSI import * rho=40*lb/cm**3 \end{python}$
to define the density in the units of pounds per cubic centimeter. The value

will be converted into SI units, in this case kg per cubic meter. Moreover unit prefixes are supported:
$\begin{python} from esys.escript.unitsSI import * p=40*Mega*Pa \end{python}$
to the the pressure to 40 Mega Pascal. Units can also be converted back from the SI system into a desired unit, e.g
$\begin{python} from esys.escript.unitsSI import * print p/atm \end{python}$
can be used print the pressure in units of atmosphere.

This is an incomplete list of supported physical units:

$\begin{datadesc}{km} unit of kilo meter \end{datadesc}$

$\begin{datadesc}{m} unit of meter \end{datadesc}$

$\begin{datadesc}{cm} unit of centi meter \end{datadesc}$

$\begin{datadesc}{mm} unit of milli meter \end{datadesc}$

$\begin{datadesc}{sec} unit of second \end{datadesc}$

$\begin{datadesc}{minute} unit of minute \end{datadesc}$

$\begin{datadesc}{h} unit of hour \end{datadesc}$

$\begin{datadesc}{day} unit of day \end{datadesc}$

$\begin{datadesc}{yr} unit of year \end{datadesc}$

$\begin{datadesc}{gram} unit of gram \end{datadesc}$

$\begin{datadesc}{kg} unit of kilo gram \end{datadesc}$

$\begin{datadesc}{lb} unit of pound \end{datadesc}$

$\begin{datadesc}{ton} metric ton \end{datadesc}$

$\begin{datadesc}{A} unit of Ampere \end{datadesc}$

$\begin{datadesc}{Hz} unit of Hertz \end{datadesc}$

$\begin{datadesc}{N} unit of Newton \end{datadesc}$

$\begin{datadesc}{Pa} unit of Pascal \end{datadesc}$

$\begin{datadesc}{atm} unit of atmosphere \end{datadesc}$

$\begin{datadesc}{J} unit of Joule \end{datadesc}$

$\begin{datadesc}{W} unit of Watt \end{datadesc}$

$\begin{datadesc}{C} unit of Coulomb \end{datadesc}$

$\begin{datadesc}{V} unit of Volt \end{datadesc}$

$\begin{datadesc}{F} unit of Farad \end{datadesc}$

$\begin{datadesc}{Ohm} unit of Ohm \end{datadesc}$

$\begin{datadesc}{K} unit of Kelvin \end{datadesc}$

$\begin{datadesc}{Celsius} unit of Celsius \end{datadesc}$