Units

Floating point quantities in input files should normally include the units in which they are expressed using one or a combination of the symbols below. Units can be combined by separating them by a spaces (for products) or "/" for division.

The symbols follow SI conventions as far as possible, but are restricted to the normal character set (no superscripts etc) so, for example, m2 stands for m² and per_m2 for m^-2.

Units with a factor of 10^-6 normally written with the greek letter μ (mu), are written with a normal latin "u" instead, so "um" stands for micrometer, and "uA" for microAmpere. Other prefixes are as normal: (p, 10^-12; n, 10^-9; u, 10^-6; m, 10^-3; c, 10^-2; K, 10³; M, 10⁶; G, 10⁹) although certain intermediate ones (d for deci, h for hecto etc) will not be understood. Get in touch if you really want them.

Several of the entries in the table are compound units for which there isn't a single name, such as per_s_per_mol used in expressing a reaction rate. These are included because they are used internally as single entities. For expressing parameters they may be used interchangeably with compound forms. For example, a concentration-dependent transition rate could be expressed as "50 per_s_per_mol" or "50 /s/mol" or 50 per_s/mol" or indeed "50 per_s per_mol" (with a space in the middle, unlike the first option).

Symbol	Name	Dimensions	Factor
none	non dimensional
any	not specified
matching	matching
truefalse	boolean
m	metre	L
cm	centimetre	L	10^-2
mm	milimetre	L	10^-3
um	micron	L	10^-6
nm	nanometre	L	10^-9
per_um	per micron	L^-1	10⁶
m2	square metres	L²
cm2	square centimetres	L²	10^-4
um2	square microns	L²	10^-12
nm2	square nanometres	L²	10^-18
per_um2	per square micron	L^-2	10¹²
m3	cubic metres	L³
l	litre	L³	10^-3
kg	kilogram	M
g	gram	M	10^-3
s	second	T
ms	millisecond	T	10^-3
us	microsecond	T	10^-6
ns	nanosecond	T	10^-9
min	minute	T	60.000 *
per_s	per second	T^-1
per_ms	per millisecond	T^-1	10³
Hz	Herz	T^-1
mol	mole		6.0221 * 10²³
per_mol	per mole		0.16605 * 10^-23
per_s_per_mol	per second per mole	T^-1	0.16605 * 10^-23
mol_per_l	molarity	L^-3	6.0221 * 10²⁶
M	molarity	L^-3	6.0221 * 10²⁶
mM	molarity	L^-3	6.0221 * 10²³
uM	molarity	L^-3	6.0221 * 10²⁰
nM	molarity	L^-3	6.0221 * 10¹⁷
per_s_per_M	per second per mole	L³T^-1	0.16605 * 10^-26
per_ms_per_M	per second per mole	L³T^-1	0.16605 * 10^-29
per_ms_per_mM	per second per mole	L³T^-1	0.16605 * 10^-32
l_per_s_per_mol	per second per mole	L³T^-1	0.16605 * 10^-26
velSI	velocity	LT^-1
accSI	acceleration	LT^-2
N	newton	MLT^-2
J	joule	ML²T^-2
A	ampere	A
mA	milliampere	A	10^-3
uA	microampere	A	10^-6
nA	nanoampere	A	10^-9
pA	picoampere	A	10^-12
C	coulomb	TA
V	volt	ML²T^-3A^-1
mV	millivolt	ML²T^-3A^-1	10^-3
KV	Kilovolt	ML²T^-3A^-1	10³
MV	Megavolt	ML²T^-3A^-1	10⁶
per_mV	per millivolt	M^-1L^-2T³A	10³
ohm	ohm	ML²T^-3A^-2
kohm	kilohm	ML²T^-3A^-2	10³
Mohm	megohm	ML²T^-3A^-2	10⁶
ohm_m	ohm metre	ML³T^-3A^-2
ohm_cm	ohm centimetre	ML³T^-3A^-2	10^-2
kohm_cm	kilohm centimetre	ML³T^-3A^-2	10¹
Gohm	gigohm	ML²T^-3A^-2	10⁹
Gohm_um	gigohm micron	ML³T^-3A^-2	10³
W	watt	ML²T^-3
F	farad	M^-1L^-2T⁴A²
uF	microfarad	M^-1L^-2T⁴A²	10^-6
nF	nanofarad	M^-1L^-2T⁴A²	10^-9
pF	picofarad	M^-1L^-2T⁴A²	10^-12
S	siemens	M^-1L^-2T³A²
uS	microsiemens	M^-1L^-2T³A²	10^-6
nS	nanosiemens	M^-1L^-2T³A²	10^-9
pS	picosiemens	M^-1L^-2T³A²	10^-12
S_per_m	siemens per metre	M^-1L^-3T³A²
e	electronic charge	TA	1.6022 * 10^-19
e_per_ms	charges pre milisecond	A	1.6022 * 10^-16
eV	electron-volts	ML²T^-2	1.6022 * 10^-19
meV	milli electron volts	ML²T^-2	1.6022 * 10^-22
MeV	Mega electron volts	ML²T^-2	1.6022 * 10^-13
eV_per_K	electron volts per Kelvin	ML²T^-2K^-1	1.6022 * 10^-19
F_per_m2	farads per square metre	M^-1L^-4T⁴A²
uF_per_cm2	microfarads per square centimetre	M^-1L^-4T⁴A²	10^-2
uF_per_um2	microfarads per square micron	M^-1L^-4T⁴A²	10⁶
nF_per_um2	nanofarads per square micron	M^-1L^-4T⁴A²	10³
pF_per_um2	picofarads per square micron	M^-1L^-4T⁴A²
K	Kelvin	K
Celsius	Celsius	K