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Build in more contextual help.
\label{Physical_Units}
\section*{Physical Units Accepted by LON-CAPA}
The following subsections show the physical units that LON-CAPA accepts.
The symbols must be used when entering the units, for example {}``35 kg''.
\subsection*{Base Units}
\begin{verbatim}
# name symbol comment
meter m # length
kilogram kg # mass
second s # time
ampere A # electric current
kelvin K # thermodynamic temperature
mole mol # amount of substance
candela cd # luminous intensity
\end{verbatim}
\subsection*{Prefixes}
\begin{verbatim}
# Prefix symbol factor
yotta Y 10^{24}
zetta Z 10^{21}
exa E 10^{18}
peta P 10^{15}
tera T 10^{12}
giga G 10^9
mega M 10^6
kilo k 10^3
hecto h 10^2
deci d 10^-1
centi c 10^-2
milli m 10^-3
micro u 10^-6
nano n 10^-9
pico p 10^{-12}
femto f 10^{-15}
atto a 10^{-18}
zepto z 10^{-21}
yocto y 10^{-24}
\end{verbatim}
\subsection*{Derived Units}
\begin{verbatim}
# Derived Unit
# name symbol comment
gram g # mass
hour hr # time
minute min # time
day day # time
year yr # time
pound lb # mass
ounce oz # mass
inch in # length
foot ft # length
mile mi # length
yard yd # length
nautical_mile n_mi # length, nautical mile (UK)
rood rood # area, rood
acre acre # area, acre
hertz Hz # frequency
litre L # volume
newton N # force
pound_force lbf # force
dyne dyn # force
pascal Pa # pressure, stress
bar bar # pressure
mmHg mmHg # pressure, millimeter of mercury
torr torr # pressure
atm atm # standard atmosphere
joule J # energy, work, heat
electronvolt eV # energy
calorie cal # energy
Btu Btu # energy
watt W # power, radiant flux
coulomb C # electric charge
volt V # electric potential, electromotive force
ohm ohm # electric resistance, use this in /ANS
ohm ohms # electric resistance
ohm Ohm # electric resistance
ohm Ohms # electric resistance
siemens S # electric conductance
farad F # electric capacitance
tesla T # magnetic flux density
weber Wb # magnetic flux
henry H # inductance
radian rad # plane angle
degree deg # plane angle (Pi rad=180 deg)
steradian sr # solid angle
lumen lm # luminous flux
lux lx # illuminance
becquerel Bq # activity (radioactive)
gray Gy # absorbed dose (of radiation)
sievert Sv # dose equivalent (dose equivalent index)
astroUnit AU # mean distance earth to sun
\end{verbatim}
\subsection*{Interpretation}
The coded units are interpreted in the order of basic unit,
derived unit, then prefix. For example, ``T'' will be matched against
``tesla'' instead of considered the prefix ``T''. Another example is that
``min'' will match
``minutes'' instead of treated as a combination of the prefix ``m'' and units.
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