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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 directory matlabroot\toolbox\physmod\unit_manager\unit_manager.

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
Amount of substance	mol	Mole
Angle	rad deg rev	Radian Degree Revolution
Angular velocity	rpm Hz	Revolutions/minute Revolutions/second
Capacitance	F pF nF uF	Farad Picofarad Nanofarad Microfarad
Charge	c	Coulomb
Conductance	S nS uS mS	Siemens Nanosiemens Microsiemens Millisiemens
Current	A pA nA uA mA kA	Ampere Picoampere Nanoampere Microampere Milliampere Kiloampere
Energy	J Btu	Joule British thermal unit
Flow rate	lpm gpm	Liter/minute Gallon/minute
Force	N dyn lbf	Newton Dyne Pound-force
Inductance	H uH mH	Henry Microhenry Millihenry
Length	m cm mm km in ft mi yd	Meter Centimeter Millimeter Kilometer Inch Foot Mile Yard
Magnetic flux	Wb	Weber
Mass	kg g mg lbm oz slug	Kilogram Gram Milligram Pound mass Ounce Slug
Pressure	Pa bar atm psi	Pascal Bar Atmosphere Pound/inch^2
Power	W HP	Watt Horsepower
Resistance	Ohm kOhm MOhm GOhm	Ohm Kiloohm Megaohm Gigaohm
Temperature	K C Fh R	Kelvin Celsius Fahrenheit Rankine
Time	s min hr	Second Minute Hour
Velocity	mph fpm fps	Miles/hour Feet/minute Feet/second
Viscosity absolute	Poise cP reyn	Poise Centipoise Reyn
Viscosity kinematic	St cSt Newt	Stokes Centistokes Newt
Volume	l gal	Liter Gallon
Voltage	V mV kV	Volt Millivolt Kilovolt

Note    This table lists the unit abbreviations defined in the product. See the following section, Specifying Units in Block Dialogs, 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.

Overview

Specifying Units in Block Dialogs

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