Unit Definitions

Simscape™ unit names are defined in the pm_units.m file, which is shipped with the product. You can open this file to see how the physical units are defined in the product, and also as an example when adding your own units. This file is located in the folder matlabroot\toolbox\physmod\common\units2\mli\m.

Default registered units and their abbreviations are listed in the following table. Use the pm_getunits command to get an up-to-date list of units currently defined in your unit registry. Use the pm_adddimension and pm_addunit commands to define additional units.

Physical Unit Abbreviations Defined by Default in the Simscape Unit Registry

Quantity	Abbreviation	Unit
Acceleration	gee	Earth gravitational acceleration (9.80665 m/s^2)
Amount of substance	mol	Mole
Angle	rad deg rev	Radian Degree Revolution
Angular velocity	rpm	Revolutions/minute
Capacitance	F pF nF uF	Farad Picofarad Nanofarad Microfarad
Charge	C nC uC mC Ah mAh kAh MAh	Coulomb Nanocoulomb Microcoulomb Millicoulomb Ampere-hour Milliampere-hour Kiloampere-hour Megaampere-hour
Conductance	S nS uS mS	Siemens Nanosiemens Microsiemens Millisiemens
Current	A pA nA uA mA kA MA	Ampere Picoampere Nanoampere Microampere Milliampere Kiloampere Megaampere
Energy	J uJ mJ kJ MJ Wh mWh kWh MWh Btu_IT eV	Joule Microjoule Millijoule Kilojoule Megajoule Watt-hour Milliwatt-hour Kilowatt-hour Megawatt-hour British thermal unit Electronvolt
Flow rate	lpm gpm	Liter/minute Gallon/minute
Force	N dyn lbf mN	Newton Dyne Pound-force Millinewton
Frequency	Hz kHz MHz GHz	Hertz Kilohertz Megahertz Gigahertz
Inductance	H uH mH	Henry Microhenry Millihenry
Length	m cm mm km um in ft mi yd	Meter Centimeter Millimeter Kilometer Micrometer Inch Foot Mile Yard
Magnetic flux	Wb	Weber
Magnetic flux density	T G	Tesla Gauss
Mass	kg g mg t lbm oz slug	Kilogram Gram Milligram Tonne (metric ton) Pound mass Ounce Slug
Pressure	Pa uPa kPa MPa GPa bar kbar atm psi ksi	Pascal Micropascal Kilopascal Megapascal Gigapascal Bar Kilobar Atmosphere Pound/inch^2 Kilopound/inch^2
Power	W uW mW kW MW HP_DIN	Watt Microwatt Milliwatt Kilowatt Megawatt Horsepower
Resistance	Ohm mOhm kOhm MOhm GOhm	Ohm Milliohm Kiloohm Megaohm Gigaohm
Temperature	K degC degF degR deltaK, deltadegC, deltadegF, deltadegR	Kelvin Celsius Fahrenheit Rankine Relative temperature units (see Thermal Unit Conversions)
Time	s min hr d ms us ns	Second Minute Hour Day Millisecond Microsecond Nanosecond
Velocity	mph fpm fps	Miles/hour Feet/minute Feet/second
Viscosity absolute	P cP reyn	Poise Centipoise Reyn
Viscosity kinematic	St cSt newt	Stokes Centistokes Newt
Volume	l gal igal	Liter US liquid gallon Imperial (UK) gallon
Voltage	V mV kV MV	Volt Millivolt Kilovolt Megavolt

Note

This table lists the unit abbreviations defined in the product. For information on how to use the abbreviations above, or mathematical expressions with these abbreviations, to specify units for the parameter values in the block dialogs, see How to Specify Units in Block Dialogs.