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# Documentation

## 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\common\units\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

QuantityAbbreviationUnit
Acceleration

gee

Earth gravitational acceleration (9.80665 m/s^2)

Amount of substance

mol

Mole

Angle

deg

rev

Degree

Revolution

Angular velocity

rpm

Revolutions/minute

Capacitance

F

pF

nF

uF

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

eV

Joule

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

lbm

oz

slug

Kilogram

Gram

Milligram

Pound mass

Ounce

Slug

Pressure

Pa

kPa

MPa

GPa

bar

kbar

atm

psi

Pascal

Kilopascal

Megapascal

Gigapascal

Bar

Kilobar

Atmosphere

Pound/inch^2

Power

W

uW

mW

kW

MW

HP

Watt

Microwatt

Milliwatt

Kilowatt

Megawatt

Horsepower

Resistance

Ohm

kOhm

MOhm

GOhm

Ohm

Kiloohm

Megaohm

Gigaohm

Temperature

K

C

Fh

R

Kelvin

Celsius

Fahrenheit

Rankine

Time

s

min

hr

ms

us

ns

Second

Minute

Hour

Millisecond

Microsecond

Nanosecond

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

igal

Liter

US liquid gallon

Imperial (UK) gallon

Voltage

V

mV

kV

Volt

Millivolt

Kilovolt

 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.