All Implemented Interfaces:

Serializable, UnitSystem
```
public final class SI
extends UnitSystemImpl
```
Provides support for the International System of Units (SI). A good on-line reference for the SI can be found at .

See Also:

Serialized Form

Field Summary

Fields
Modifier and Type	Field	Description
`static Unit`	`AMOUNT_OF_SUBSTANCE_UNIT`	The unit corresponding to the quantity of amount of substance.
`static BaseUnit`	`AMPERE`	Base unit of electric current.
`static Unit`	`ANGSTROM`	Special derived unit -- temporarily accepted for use with the SI -- for the quantity of length.
`static Unit`	`ARC_DEGREE`	Special derived unit -- accepted for use with the SI -- for the quantity of plane angle.
`static Unit`	`ARC_MINUTE`	Special derived unit -- accepted for use with the SI -- for the quantity of plane angle.
`static Unit`	`ARC_SECOND`	Special derived unit -- accepted for use with the SI -- for the quantity of plane angle.
`static Unit`	`ARE`	Special derived unit -- temporarily accepted for use with the SI -- for the quantity of area.
`static Unit`	`BAR`	Special derived unit -- temporarily accepted for use with the SI -- for the quantity of pressure.
`static Unit`	`BARN`	Special derived unit -- temporarily accepted for use with the SI -- for the quantity of area.
`static Unit`	`BECQUEREL`	Special derived unit for the quantity of activity of a radionuclide.
`static BaseUnit`	`CANDELA`	Base unit of luminous intensity.
`static Unit`	`COULOMB`	Special derived unit for the quantity of electric charge or quantity of electricity.
`static Unit`	`CURIE`	Special derived unit -- temporarily accepted for use with the SI until the year 2000 according to the USA National Institute of Standards and Technology -- for the quantity of activity of a radionuclide.
`static Unit`	`DAY`	Special derived unit -- accepted for use with the SI -- for the quantity of time.
`static Unit`	`DEGREE_CELSIUS`	Special derived unit for the quantity of Celsius temperature.
`static Unit`	`ELECTRIC_CURRENT_UNIT`	The unit corresponding to the quantity of electric current.
`static Unit`	`FARAD`	Special derived unit for the quantity of electric capacitance.
`static Unit`	`GAL`	Special derived unit -- temporarily accepted for use with the SI -- for the quantity of acceleration.
`static Unit`	`GRAY`	Special derived unit for the quantity of absorbed dose, specific energy (imparted), or kerms.
`static Unit`	`HECTARE`	Special derived unit -- temporarily accepted for use with the SI -- for the quantity of area.
`static Unit`	`HENRY`	Special derived unit for the quantity of inductance.
`static Unit`	`HERTZ`	Special derived unit for the quantity of frequency.
`static Unit`	`HOUR`	Special derived unit -- accepted for use with the SI -- for the quantity of time.
`static Unit`	`JOULE`	Special derived unit for the quantity of energy, work, or quantity of heat.
`static BaseUnit`	`KELVIN`	Base unit of thermodynamic temperature.
`static BaseUnit`	`KILOGRAM`	Base unit of mass.
`static Unit`	`KNOT`	Special derived unit -- temporarily accepted for use with the SI -- for the quantity of speed.
`static Unit`	`LENGTH_UNIT`	The unit corresponding to the quantity of length.
`static Unit`	`LITER`	Special derived unit -- accepted for use with the SI -- for the quantity of volume.
`static Unit`	`LITRE`	Synomym for `LITER`.
`static Unit`	`LUMEN`	Special derived unit for the quantity of luminous flux.
`static Unit`	`LUMINOUS_INTENSITY_UNIT`	The unit corresponding to the quantity of luminous intensity.
`static Unit`	`LUX`	Special derived unit for the quantity of illuminance.
`static Unit`	`MASS_UNIT`	The unit corresponding to the quantity of mass.
`static BaseUnit`	`METER`	Base unit of length.
`static BaseUnit`	`METRE`	Synonym for `METER`.
`static Unit`	`METRIC_TON`	Special derived unit -- accepted for use with the SI -- for the quantity of mass.
`static Unit`	`MINUTE`	Special derived unit -- accepted for use with the SI -- for the quantity of time.
`static BaseUnit`	`MOLE`	Base unit of amount of substance.
`static Unit`	`NAUTICAL_MILE`	Special derived unit -- temporarily accepted for use with the SI -- for the quantity of length.
`static Unit`	`NEWTON`	Special derived unit for the quantity of force.
`static Unit`	`OHM`	Special derived unit for the quantity of electric resistance.
`static Unit`	`PASCAL`	Special derived unit for the quantity of pressure or stress.
`static Unit`	`PLANE_ANGLE_UNIT`	The unit corresponding to the quantity of plane angle.
`static Unit`	`RAD`	Special derived unit -- temporarilty accepted for use with the SI until the year 2000 according to the USA National Institute of Standards and Technology -- for the quantity of absorbed dose.
`static BaseUnit`	`RADIAN`	Base unit of angular measure.
`static Unit`	`REM`	Special derived unit -- temporarilty accepted for use with the SI until the year 2000 according to the USA National Institute of Standards and Technology -- for the quantity of equivalent absorbed dose.
`static Unit`	`ROENTGEN`	Special derived unit -- temporarily accepted for use with the SI until the year 2000 according to the USA National Institute of Standards and Technology -- for the quantity of electric charge per mass.
`static BaseUnit`	`SECOND`	Base unit of time.
`static Unit`	`SIEMENS`	Special derived unit for the quantity of electric conductance.
`static Unit`	`SIEVERT`	Special derived unit for the quantity of dose equivalent, ambient dose equivalent, directional dose equivalent, personal dose equivalent, or equivalent dose.
`static Unit`	`SOLID_ANGLE_UNIT`	The unit corresponding to the quantity of solid angle.
`static BaseUnit`	`STERADIAN`	Base unit of solid angle.
`static Unit`	`TESLA`	Special derived unit for the quantity of magnetic flux density.
`static Unit`	`THERMODYNAMIC_TEMPERATURE_UNIT`	The unit corresponding to the quantity of thermodynamic temperature.
`static Unit`	`TIME_UNIT`	The unit corresponding to the quantity of time.
`static Unit`	`TONNE`	Synomym for `METRIC_TON`.
`static Unit`	`VOLT`	Special derived unit for the quantity of electric potential, potential difference, or electromotive force.
`static Unit`	`WATT`	Special derived unit for the quantity of power or radiant flux.
`static Unit`	`WEBER`	Special derived unit for the quantity of magnetic flux.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type Method Description

static SI instance()
Returns an instance of the SI system of units.
- Methods inherited from class ucar.units.UnitSystemImpl
  getBaseUnit, getBaseUnitDB, getUnitDB
- Methods inherited from class java.lang.Object
  clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - AMOUNT_OF_SUBSTANCE_UNIT
```
public static final Unit AMOUNT_OF_SUBSTANCE_UNIT
```
    The unit corresponding to the quantity of amount of substance.
  - ELECTRIC_CURRENT_UNIT
```
public static final Unit ELECTRIC_CURRENT_UNIT
```
    The unit corresponding to the quantity of electric current.
  - LENGTH_UNIT
```
public static final Unit LENGTH_UNIT
```
    The unit corresponding to the quantity of length.
  - LUMINOUS_INTENSITY_UNIT
```
public static final Unit LUMINOUS_INTENSITY_UNIT
```
    The unit corresponding to the quantity of luminous intensity.
  - MASS_UNIT
```
public static final Unit MASS_UNIT
```
    The unit corresponding to the quantity of mass.
  - PLANE_ANGLE_UNIT
```
public static final Unit PLANE_ANGLE_UNIT
```
    The unit corresponding to the quantity of plane angle.
  - SOLID_ANGLE_UNIT
```
public static final Unit SOLID_ANGLE_UNIT
```
    The unit corresponding to the quantity of solid angle.
  - THERMODYNAMIC_TEMPERATURE_UNIT
```
public static final Unit THERMODYNAMIC_TEMPERATURE_UNIT
```
    The unit corresponding to the quantity of thermodynamic temperature.
  - TIME_UNIT
```
public static final Unit TIME_UNIT
```
    The unit corresponding to the quantity of time.
  - AMPERE
```
public static final BaseUnit AMPERE
```
    Base unit of electric current. The ampere is that constant current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross section, and placed 1 meter apart in vacuum, would produce between these conductors a force equal to 2 x 10^-7 newton per meter of length.
  - CANDELA
```
public static final BaseUnit CANDELA
```
    Base unit of luminous intensity. The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 x 10^12 hertz and that has a radiant intensity in that direction of (1/683) watt per steradian.
  - KELVIN
```
public static final BaseUnit KELVIN
```
    Base unit of thermodynamic temperature. The kelvin, unit of thermodynamic temperature, is the fraction 1/273.16 of the thermodynamic temperature of the triple point of water.
  - KILOGRAM
```
public static final BaseUnit KILOGRAM
```
    Base unit of mass. The kilogram is the unit of mass; it is equal to the mass of the international prototype of the kilogram.
  - METER
```
public static final BaseUnit METER
```
    Base unit of length. The meter is the length of the path travelled by light in vacuum during a time interval of 1/299 792 458 of a second.
  - METRE
```
public static final BaseUnit METRE
```
    Synonym for METER.
  - MOLE
```
public static final BaseUnit MOLE
```
    Base unit of amount of substance. The mole is the amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon 12.
  - SECOND
```
public static final BaseUnit SECOND
```
    Base unit of time. The second is the duration of 9 192 631 770 periods of the radiation corresponding to the trasition between the two hyperfine levels of the ground state of the cesium-133 atom.
  - RADIAN
```
public static final BaseUnit RADIAN
```
    Base unit of angular measure. The radian is the plane angle between two radii of a circle that cut off on the circumference an arc equal in length to the radius.
  - STERADIAN
```
public static final BaseUnit STERADIAN
```
    Base unit of solid angle. The steradian is the solid angle that, having its vertex in the center of a sphere, cuts off an area on the surface of the sphere equal to that of a square with sides of length equal to the radius of the sphere.
  - HERTZ
```
public static final Unit HERTZ
```
    Special derived unit for the quantity of frequency.
  - NEWTON
```
public static final Unit NEWTON
```
    Special derived unit for the quantity of force.
  - PASCAL
```
public static final Unit PASCAL
```
    Special derived unit for the quantity of pressure or stress.
  - JOULE
```
public static final Unit JOULE
```
    Special derived unit for the quantity of energy, work, or quantity of heat.
  - WATT
```
public static final Unit WATT
```
    Special derived unit for the quantity of power or radiant flux.
  - COULOMB
```
public static final Unit COULOMB
```
    Special derived unit for the quantity of electric charge or quantity of electricity.
  - VOLT
```
public static final Unit VOLT
```
    Special derived unit for the quantity of electric potential, potential difference, or electromotive force.
  - FARAD
```
public static final Unit FARAD
```
    Special derived unit for the quantity of electric capacitance.
  - OHM
```
public static final Unit OHM
```
    Special derived unit for the quantity of electric resistance.
  - SIEMENS
```
public static final Unit SIEMENS
```
    Special derived unit for the quantity of electric conductance.
  - WEBER
```
public static final Unit WEBER
```
    Special derived unit for the quantity of magnetic flux.
  - TESLA
```
public static final Unit TESLA
```
    Special derived unit for the quantity of magnetic flux density.
  - HENRY
```
public static final Unit HENRY
```
    Special derived unit for the quantity of inductance.
  - DEGREE_CELSIUS
```
public static final Unit DEGREE_CELSIUS
```
    Special derived unit for the quantity of Celsius temperature.
  - LUMEN
```
public static final Unit LUMEN
```
    Special derived unit for the quantity of luminous flux.
  - LUX
```
public static final Unit LUX
```
    Special derived unit for the quantity of illuminance.
  - BECQUEREL
```
public static final Unit BECQUEREL
```
    Special derived unit for the quantity of activity of a radionuclide.
  - GRAY
```
public static final Unit GRAY
```
    Special derived unit for the quantity of absorbed dose, specific energy (imparted), or kerms.
  - SIEVERT
```
public static final Unit SIEVERT
```
    Special derived unit for the quantity of dose equivalent, ambient dose equivalent, directional dose equivalent, personal dose equivalent, or equivalent dose.
  - MINUTE
```
public static final Unit MINUTE
```
    Special derived unit -- accepted for use with the SI -- for the quantity of time.
  - HOUR
```
public static final Unit HOUR
```
    Special derived unit -- accepted for use with the SI -- for the quantity of time.
  - DAY
```
public static final Unit DAY
```
    Special derived unit -- accepted for use with the SI -- for the quantity of time.
  - ARC_DEGREE
```
public static final Unit ARC_DEGREE
```
    Special derived unit -- accepted for use with the SI -- for the quantity of plane angle.
  - ARC_MINUTE
```
public static final Unit ARC_MINUTE
```
    Special derived unit -- accepted for use with the SI -- for the quantity of plane angle.
  - ARC_SECOND
```
public static final Unit ARC_SECOND
```
    Special derived unit -- accepted for use with the SI -- for the quantity of plane angle.
  - LITER
```
public static final Unit LITER
```
    Special derived unit -- accepted for use with the SI -- for the quantity of volume.
  - LITRE
```
public static final Unit LITRE
```
    Synomym for LITER.
  - METRIC_TON
```
public static final Unit METRIC_TON
```
    Special derived unit -- accepted for use with the SI -- for the quantity of mass.
  - TONNE
```
public static final Unit TONNE
```
    Synomym for METRIC_TON.
  - NAUTICAL_MILE
```
public static final Unit NAUTICAL_MILE
```
    Special derived unit -- temporarily accepted for use with the SI -- for the quantity of length.
  - KNOT
```
public static final Unit KNOT
```
    Special derived unit -- temporarily accepted for use with the SI -- for the quantity of speed.
  - ANGSTROM
```
public static final Unit ANGSTROM
```
    Special derived unit -- temporarily accepted for use with the SI -- for the quantity of length.
  - ARE
```
public static final Unit ARE
```
    Special derived unit -- temporarily accepted for use with the SI -- for the quantity of area.
  - HECTARE
```
public static final Unit HECTARE
```
    Special derived unit -- temporarily accepted for use with the SI -- for the quantity of area.
  - BARN
```
public static final Unit BARN
```
    Special derived unit -- temporarily accepted for use with the SI -- for the quantity of area.
  - BAR
```
public static final Unit BAR
```
    Special derived unit -- temporarily accepted for use with the SI -- for the quantity of pressure.
  - GAL
```
public static final Unit GAL
```
    Special derived unit -- temporarily accepted for use with the SI -- for the quantity of acceleration.
  - CURIE
```
public static final Unit CURIE
```
    Special derived unit -- temporarily accepted for use with the SI until the year 2000 according to the USA National Institute of Standards and Technology -- for the quantity of activity of a radionuclide.
  - ROENTGEN
```
public static final Unit ROENTGEN
```
    Special derived unit -- temporarily accepted for use with the SI until the year 2000 according to the USA National Institute of Standards and Technology -- for the quantity of electric charge per mass.
  - RAD
```
public static final Unit RAD
```
    Special derived unit -- temporarilty accepted for use with the SI until the year 2000 according to the USA National Institute of Standards and Technology -- for the quantity of absorbed dose.
  - REM
```
public static final Unit REM
```
    Special derived unit -- temporarilty accepted for use with the SI until the year 2000 according to the USA National Institute of Standards and Technology -- for the quantity of equivalent absorbed dose.
- Method Detail
  - instance
```
public static SI instance()
                   throws UnitSystemException
```
    Returns an instance of the SI system of units.
    
    Returns:
    
    An instance of the SI system of units.
    
    Throws:
    
    UnitSystemException - Couldn't create an instance of the SI system of units.

Class SI

Field Summary

Method Summary

Methods inherited from class ucar.units.UnitSystemImpl

Methods inherited from class java.lang.Object

Field Detail

AMOUNT_OF_SUBSTANCE_UNIT

ELECTRIC_CURRENT_UNIT

LENGTH_UNIT

LUMINOUS_INTENSITY_UNIT

MASS_UNIT

PLANE_ANGLE_UNIT

SOLID_ANGLE_UNIT

THERMODYNAMIC_TEMPERATURE_UNIT

TIME_UNIT

AMPERE

CANDELA

KELVIN

KILOGRAM

METER

METRE

MOLE

SECOND

RADIAN

STERADIAN

HERTZ

NEWTON

PASCAL

JOULE

WATT

COULOMB

VOLT

FARAD

OHM

SIEMENS

WEBER

TESLA

HENRY

DEGREE_CELSIUS

LUMEN

LUX

BECQUEREL

GRAY

SIEVERT

MINUTE

HOUR

DAY

ARC_DEGREE

ARC_MINUTE

ARC_SECOND

LITER

LITRE

METRIC_TON

TONNE

NAUTICAL_MILE

KNOT

ANGSTROM

ARE

HECTARE

BARN

BAR

GAL

CURIE

ROENTGEN

RAD

REM

Method Detail

instance