Pre-defined units and сonstants

In the following, only non-prefixed units are listed. To get a more detailed information about a unit, and to get information about prefixed units, use Julia help, e.g.

help?> Unitful.kW
  Unitful.kW

  A prefixed unit, equal to 10^3 W.

  Dimension: 𝐋² 𝐌 𝐓⁻³

  See also: Unitful.W.

For prefixes, see below.

Base dimensions

Amount

Unitful.𝐍 — Constant

Unitful.𝐍

A dimension representing amount of substance.

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Unitful.Amount — Type

Unitful.Amount{T, U}

A supertype for quantities and levels of dimension Unitful.𝐍 with a value of type T and units U.

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Unitful.mol — Constant

Unitful.mol

The mole, the SI base unit for amount of substance.

Dimension: Unitful.𝐍.

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Current

Unitful.𝐈 — Constant

Unitful.𝐈

A dimension representing electric current.

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Unitful.Current — Type

Unitful.Current{T, U}

A supertype for quantities and levels of dimension Unitful.𝐈 with a value of type T and units U.

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Unitful.A — Constant

Unitful.A

The ampere, the SI base unit of electric current.

Dimension: Unitful.𝐈.

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Length

Unitful.𝐋 — Constant

Unitful.𝐋

A dimension representing length.

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Unitful.Length — Type

Unitful.Length{T, U}

A supertype for quantities and levels of dimension Unitful.𝐋 with a value of type T and units U.

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Unitful.angstrom — Constant

Unitful.angstrom
Unitful.Å

The angstrom, a metric unit of length defined as 1/10 nm.

Dimension: Unitful.𝐋.

See also: Unitful.m.

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Unitful.fm — Constant

Unitful.fm

A prefixed unit, equal to 10^-15 m.

Dimension: 𝐋

See also: Unitful.m.

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Unitful.ft — Constant

Unitful.ft

The foot, a US customary unit of length defined as 12 inch.

Dimension: Unitful.𝐋.

See also: Unitful.m.

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Unitful.yd — Constant

Unitful.yd

The yard, a US customary unit of length defined as 3 ft.

Dimension: Unitful.𝐋.

Luminosity

Unitful.𝐉 — Constant

Unitful.𝐉

A dimension representing luminous intensity.

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Unitful.Luminosity — Type

Unitful.Luminosity{T, U}

A supertype for quantities and levels of dimension Unitful.𝐉 with a value of type T and units U.

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Unitful.cd — Constant

Unitful.cd

The candela, the SI base unit of luminous intensity.

Dimension: Unitful.𝐉.

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Unitful.lm — Constant

Unitful.lm

The lumen, an SI unit of luminous flux, defined as 1 cd × sr.

Dimension: Unitful.𝐉.

Mass

Unitful.𝐌 — Constant

Unitful.𝐌

A dimension representing mass.

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Unitful.Mass — Type

Unitful.Mass{T, U}

A supertype for quantities and levels of dimension Unitful.𝐌 with a value of type T and units U.

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Unitful.dr — Constant

Unitful.dr

The dram, a US customary unit of mass defined as 1/16 oz.

Dimension: Unitful.𝐌.

See also: Unitful.kg.

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Unitful.gr — Constant

Unitful.gr

The grain, a US customary unit of mass defined as 1/7000 lb.

Dimension: Unitful.𝐌.

Temperature

Unitful.𝚯 — Constant

Unitful.𝚯

A dimension representing thermodynamic temperature.

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Unitful.Temperature — Type

Unitful.Temperature{T, U}

A supertype for quantities and levels of dimension Unitful.𝚯 with a value of type T and units U.

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Unitful.K — Constant

Unitful.K

The kelvin, the SI base unit of thermodynamic temperature.

Dimension: Unitful.𝚯.

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Unitful.Ra — Constant

Unitful.Ra

The rankine, a US customary unit of temperature defined as 5/9 K.

Dimension: Unitful.𝚯.

Time

Unitful.𝐓 — Constant

Unitful.𝐓

A dimension representing time.

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Unitful.Time — Type

Unitful.Time{T, U}

A supertype for quantities and levels of dimension Unitful.𝐓 with a value of type T and units U.

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Unitful.d — Constant

Unitful.d

The day, a unit of time defined as 24 hr.

Dimension: Unitful.𝐓.

Derived dimensions

Acceleration

Unitful.Acceleration — Type

Unitful.Acceleration{T, U}

A supertype for quantities and levels of dimension 𝐋 / 𝐓 ^ 2 with a value of type T and units U.

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Unitful.Gal — Constant

Unitful.Gal

The gal, a CGS unit of acceleration, defined as 1 cm / s^2.

Dimension: 𝐋 𝐓^-2.

See also: Unitful.m, Unitful.s.

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Area

Unitful.Area — Type

Unitful.Area{T, U}

A supertype for quantities and levels of dimension 𝐋 ^ 2 with a value of type T and units U.

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Unitful.a — Constant

Unitful.a

The are, a metric unit of area, defined as 100 m^2.

Dimension: 𝐋^2.

BField

Unitful.BField — Type

Unitful.BField{T, U}

A supertype for quantities and levels of dimension 𝐈 ^ -1 * 𝐌 * 𝐓 ^ -2 with a value of type T and units U.

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Unitful.Gauss — Constant

Unitful.Gauss

The gauss, a CGS unit of magnetic B-field strength, defined as 1 Mx / cm^2.

Dimension: 𝐌 𝐈^-1 𝐓^-2.

Capacitance

Unitful.Capacitance — Type

Unitful.Capacitance{T, U}

A supertype for quantities and levels of dimension 𝐈 ^ 2 * 𝐋 ^ -2 * 𝐌 ^ -1 * 𝐓 ^ 4 with a value of type T and units U.

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Unitful.F — Constant

Unitful.F

The farad, an SI unit of electrical capacitance, defined as 1 s^4 × A^2 / (kg × m^2).

Dimension: 𝐈^2 𝐓^4 𝐋^-2 𝐌^-1.

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Charge

Unitful.Charge — Type

Unitful.Charge{T, U}

A supertype for quantities and levels of dimension 𝐈 * 𝐓 with a value of type T and units U.

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Unitful.C — Constant

Unitful.C

The coulomb, an SI unit of electric charge, defined as 1 A × s.

Dimension: 𝐈 𝐓.

DynamicViscosity

Unitful.DynamicViscosity — Type

Unitful.DynamicViscosity{T, U}

A supertype for quantities and levels of dimension 𝐌 * 𝐋 ^ -1 * 𝐓 ^ -1 with a value of type T and units U.

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Unitful.P — Constant

Unitful.P

The poise, a CGS unit of dynamic viscosity, defined as 1 dyn × s / cm^2.

Dimension: 𝐌 𝐋^-1 𝐓^-1.

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ElectricalConductance

Unitful.ElectricalConductance — Type

Unitful.ElectricalConductance{T, U}

A supertype for quantities and levels of dimension 𝐈 ^ 2 * 𝐋 ^ -2 * 𝐌 ^ -1 * 𝐓 ^ 3 with a value of type T and units U.

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Unitful.S — Constant

Unitful.S

The siemens, an SI unit of electrical conductance, defined as 1 Ω^-1.

Dimension: 𝐈^2 𝐓^3 𝐋^-2 𝐌^-1.

ElectricalResistance

Unitful.ElectricalResistance — Type

Unitful.ElectricalResistance{T, U}

A supertype for quantities and levels of dimension 𝐈 ^ -2 * 𝐋 ^ 2 * 𝐌 * 𝐓 ^ -3 with a value of type T and units U.

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Unitful.Ω — Constant

Unitful.Ω

The ohm, an SI unit of electrical resistance, defined as 1 V / A.

Dimension: 𝐋^2 𝐌 𝐈^-2 𝐓^-3.

Energy

Unitful.Energy — Type

Unitful.Energy{T, U}

A supertype for quantities and levels of dimension (𝐌 * 𝐋 ^ 2) / 𝐓 ^ 2 with a value of type T and units U.

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Unitful.btu — Constant

Unitful.btu

The British thermal unit, a US customary unit of heat defined by ISO 31-4 as exactly 1055.06 J.

Dimension: 𝐋^2 𝐌 𝐓^-2.

Force

Unitful.Force — Type

Unitful.Force{T, U}

A supertype for quantities and levels of dimension (𝐌 * 𝐋) / 𝐓 ^ 2 with a value of type T and units U.

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Unitful.dyn — Constant

Unitful.dyn

The dyne, a CGS unit of force, defined as 1 g × cm / s^2.

Dimension: 𝐋 𝐌 𝐓^-2.

See also: Unitful.cm, Unitful.s, Unitful.g.

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Unitful.lbf — Constant

Unitful.lbf

The pound-force, a US customary unit of force defined as 1 lb × ge.

Dimension: 𝐋 𝐌 𝐓^-2.

Frequency

Unitful.Frequency — Type

Unitful.Frequency{T, U}

A supertype for quantities and levels of dimension inv(𝐓) with a value of type T and units U.

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Unitful.Bq — Constant

Unitful.Bq

The becquerel, an SI unit of radioactivity, defined as 1 nuclear decay per s.

Dimension: 𝐓^-1.

HField

Unitful.HField — Type

Unitful.HField{T, U}

A supertype for quantities and levels of dimension 𝐈 / 𝐋 with a value of type T and units U.

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Unitful.Oe — Constant

Unitful.Oe

The oersted, a CGS unit of magnetic H-field strength, defined as 1000 A / (4π × m).

Dimension: 𝐈 𝐋^-1.

Inductance

Unitful.Inductance — Type

Unitful.Inductance{T, U}

A supertype for quantities and levels of dimension 𝐈 ^ -2 * 𝐋 ^ 2 * 𝐌 * 𝐓 ^ -2 with a value of type T and units U.

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Unitful.H — Constant

Unitful.H

The henry, an SI unit of electrical inductance, defined as 1 J / A^2.

Dimension: 𝐋^2 𝐌 𝐈^-2 𝐓^-2.

KinematicViscosity

Unitful.KinematicViscosity — Type

Unitful.KinematicViscosity{T, U}

A supertype for quantities and levels of dimension 𝐋 ^ 2 * 𝐓 ^ -1 with a value of type T and units U.

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Unitful.St — Constant

Unitful.St

The stokes, a CGS unit of kinematic viscosity, defined as 1 cm^2 / s.

Dimension: 𝐌^2 𝐓^-1.

MagneticFlux

Unitful.MagneticFlux — Type

Unitful.MagneticFlux{T, U}

A supertype for quantities and levels of dimension 𝐈 ^ -1 * 𝐋 ^ 2 * 𝐌 * 𝐓 ^ -2 with a value of type T and units U.

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Unitful.Mx — Constant

Unitful.Mx

The maxwell, a CGS unit of magnetic flux, defined as 1 Gauss × cm^2.

Dimension: 𝐋^2 𝐌 𝐈^-1 𝐓^-2.

MolarFlow

Unitful.MolarFlow — Type

Unitful.MolarFlow{T, U}

A supertype for quantities and levels of dimension 𝐍 / 𝐓 with a value of type T and units U.

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Unitful.kat — Constant

Unitful.kat

The katal, an SI unit of catalytic activity, defined as 1 mol of catalyzed substrate per s.

Dimension: 𝐍 𝐓^-1.

Molarity

Unitful.Molarity — Type

Unitful.Molarity{T, U}

A supertype for quantities and levels of dimension 𝐍 / 𝐋 ^ 3 with a value of type T and units U.

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Unitful.M — Constant

Unitful.M

A unit for measuring molar concentration, equal to 1 mol/L.

Dimension: 𝐍 𝐋^-3.

Power

Unitful.Power — Type

Unitful.Power{T, U}

A supertype for quantities and levels of dimension 𝐋 ^ 2 * 𝐌 * 𝐓 ^ -3 with a value of type T and units U.

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Unitful.W — Constant

Unitful.W

The watt, an SI unit of power, defined as 1 J / s.

Dimension: 𝐋^2 𝐌 𝐓^-3.

Pressure

Unitful.Pressure — Type

Unitful.Pressure{T, U}

A supertype for quantities and levels of dimension 𝐌 * 𝐋 ^ -1 * 𝐓 ^ -2 with a value of type T and units U.

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Unitful.atm — Constant

Unitful.atm

The standard atmosphere, a unit of pressure, defined as 101,325 Pa.

Dimension: 𝐌 𝐋^-1 𝐓^-2.

Velocity

Unitful.Velocity — Type

Unitful.Velocity{T, U}

A supertype for quantities and levels of dimension 𝐋 / 𝐓 with a value of type T and units U.

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Unitful.c — Constant

Unitful.c

The speed of light in a vacuum, a unit of speed, defined as exactly 2.997,924,58 × 10^8 m/s.

Unitful.c0 is a quantity (with units m/s) whereas Unitful.c is a unit equal to c0.

Dimension: 𝐋 𝐓^-1.

See also: Unitful.m, Unitful.s.

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Voltage

Unitful.Voltage — Type

Unitful.Voltage{T, U}

A supertype for quantities and levels of dimension 𝐈 ^ -1 * 𝐋 ^ 2 * 𝐌 * 𝐓 ^ -3 with a value of type T and units U.

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Unitful.V — Constant

Unitful.V

The volt, an SI unit of electric potential, defined as 1 W / A.

Dimension: 𝐋^2 𝐌 𝐈^-1 𝐓^-3.

Volume

Unitful.Volume — Type

Unitful.Volume{T, U}

A supertype for quantities and levels of dimension 𝐋 ^ 3 with a value of type T and units U.

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Unitful.L — Constant

Unitful.L
Unitful.l

The liter, a metric unit of volume, defined as 1000 cm^3.

Dimension: 𝐋^3.

Dimensionless units

Unitful.° — Constant

Unitful.°
Unitful.deg

The degree, a unit of angle. There are 360° in a circle.

Dimension: Unitful.NoDims.

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Unitful.pcm — Constant

Unitful.pcm

Percentmille, a unit meaning parts per hundred thousand.

Dimension: Unitful.NoDims.

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Unitful.percent — Constant

Unitful.percent

Percent, a unit meaning parts per hundred. Printed as "%".

Dimension: Unitful.NoDims.

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Unitful.permille — Constant

Unitful.permille

Permille, a unit meaning parts per thousand. Printed as "‰".

Dimension: Unitful.NoDims.

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Unitful.pertenthousand — Constant

Unitful.pertenthousand

Permyriad, a unit meaning parts per ten thousand. Printed as "‱".

Dimension: Unitful.NoDims.

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Unitful.ppb — Constant

Unitful.ppb

Perbillion, a unit meaning parts per billion (in the short-scale sense), i.e., 10^-9.

Dimension: Unitful.NoDims.

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Unitful.ppm — Constant

Unitful.ppm

Permillion, a unit meaning parts per million.

Dimension: Unitful.NoDims.

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Unitful.ppq — Constant

Unitful.ppq

Perquadrillion, a unit meaning parts per quadrillion (in the short-scale sense), i.e., 10^-15.

Dimension: Unitful.NoDims.

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Unitful.ppt — Constant

Unitful.ppt

Pertrillion, a unit meaning parts per trillion (in the short-scale sense), i.e., 10^-12.

Dimension: Unitful.NoDims.

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Unitful.rad — Constant

Unitful.rad

The radian, a unit of angle. There are 2π rad in a circle.

Dimension: Unitful.NoDims.

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Unitful.sr — Constant

Unitful.sr

The steradian, a unit of spherical angle. There are 4π sr in a sphere.

Dimension: Unitful.NoDims.

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Logarithmic units

Unit	Name
`dB`	Decibel
`B`	Bel
`Np`	Neper
`cNp`	Centineper

Unit	Reference level
`dBHz`	1Hz
`dBm`	1mW
`dBV`	1V
`dBu`	sqrt(0.6)V
`dBμV`	1μV
`dBSPL`	20μPa
`dBFS`	RootPowerRatio(1)
`dBΩ`	1Ω
`dBS`	1S

Physical constants

Unitful.c0 — Constant

Unitful.c0

A quantity representing the speed of light in a vacuum, defined as exactly 2.997,924,58 × 10^8 m/s.

Unitful.c0 is a quantity (with units m/s) whereas Unitful.c is a unit equal to c0.

Dimension: 𝐋 𝐓^-1.

See also: Unitful.m, Unitful.s.

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Unitful.G — Constant

Unitful.G

A quantity representing the universal gravitational constant, equal to 6.674,30 × 10^-11 m^3 / (kg × s^2) (the CODATA 2018 recommended value).

Dimension: 𝐋^3 𝐌^-1 𝐓^-2.

See also: Unitful.m, Unitful.kg, Unitful.s.

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Unitful.gn — Constant

Unitful.gn

A quantity representing the nominal acceleration due to gravity in a vacuum near the surface of the earth, defined by standard to be exactly 9.806,65 m / s^2.

Unitful.gn is a quantity (with units m/s^2) whereas Unitful.ge is a unit equal to gn.

Dimension: 𝐋 𝐓^-2.

See also: Unitful.m, Unitful.s.

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Unitful.h — Constant

Unitful.h

A quantity representing Planck's constant, defined as exactly 6.626,070,15 × 10^-34 J × s.

Dimension: 𝐋^2 𝐌 𝐓^-1.

See also: Unitful.kg.

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Unitful.mn — Constant

Unitful.mn

A quantity representing the rest mass of a neutron, equal to 1.674,927,498,04 × 10^-27 kg (the CODATA 2018 recommended value).

Dimension: Unitful.𝐌.

See also: Unitful.kg.

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Unitful.mp — Constant

Unitful.mp

A quantity representing the rest mass of a proton, equal to 1.672,621,923,69 × 10^-27 kg (the CODATA 2018 recommended value).

Dimension: Unitful.𝐌.

See also: Unitful.kg.

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Unitful.Na — Constant

Unitful.Na

A quantity representing Avogadro's constant, defined as exactly 6.022,140,76 × 10^23 / mol.

Dimension: 𝐍^-1.

See also: Unitful.m.

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Unitful.Z0 — Constant

Unitful.Z0

A quantity representing the impedance of free space, a constant defined as μ0 × c.

Dimension: 𝐋^2 𝐌 𝐈^-2 𝐓^-3.

Metric (SI) Prefixes

Prefix	Name	Power of Ten
y	yocto	-24
z	zepto	-21
a	atto	-18
f	femto	-15
p	pico	-12
n	nano	-9
μ	micro	-6
m	milli	-3
c	centi	-2
d	deci	-1
da	deca	1
h	hecto	2
k	kilo	3
M	mega	6
G	giga	9
T	tera	12
P	peta	15
E	exa	18
Z	zetta	21
Y	yotta	24