javax.units
Class SI

Object
  SI

public final class SI

extends Object

This class contains SI (Système International d'Unités) base units, and derived units.

It also defines the 20 SI prefixes used to form decimal multiples and submultiples of SI units (e.g. Unit HECTO_PASCAL = SI.HECTO(SI.PASCAL);)

See also: BIPM, International System of Units

Field Summary

static BaseUnit	AMPERE The base unit for electric current quantities (A).
static Unit	BECQUEREL The derived unit for activity of a radionuclide (Bq).
static Unit	BIT The unit for binary information (bit).
static BaseUnit	CANDELA The base unit for luminous intensity quantities (cd).
static Unit	CELSIUS The derived unit for Celsius temperature (°C).
static Unit	COULOMB The derived unit for electric charge, quantity of electricity (C).
static Unit	FARAD The derived unit for capacitance (F).
static Unit	GRAM The derived unit for mass quantities (g).
static Unit	GRAY The derived unit for absorbed dose, specific energy (imparted), kerma (Gy).
static Unit	HENRY The derived unit for inductance (H).
static Unit	HERTZ The derived unit for frequency (Hz).
static Unit	JOULE The derived unit for energy, work, quantity of heat (J).
static Unit	KATAL The derived unit for catalytic activity (kat).
static BaseUnit	KELVIN The base unit for thermodynamic temperature quantities (K).
static BaseUnit	KILOGRAM The base unit for mass quantities (kg).
static Unit	LUMEN The derived unit for luminous flux (lm).
static Unit	LUX The derived unit for illuminance (lx).
static BaseUnit	METER The base unit for length quantities (m).
static BaseUnit	MOLE The base unit for amount of substance quantities (mol).
static Unit	NEWTON The derived unit for force (N).
static Unit	OHM The derived unit for electric resistance (Ω).
static Unit	PASCAL The derived unit for pressure, stress (Pa).
static Unit	RADIAN The unit for plane angle quantities (rad).
static BaseUnit	SECOND The base unit for duration quantities (s).
static Unit	SIEMENS The derived unit for electric conductance (S).
static Unit	SIEVERT The derived unit for dose equivalent (Sv).
static Unit	STERADIAN The unit for solid angle quantities (sr).
static Unit	TESLA The derived unit for magnetic flux density (T).
static Unit	VOLT The derived unit for electric potential difference, electromotive force (V).
static Unit	WATT The derived unit for power, radiant, flux (W).
static Unit	WEBER The derived unit for magnetic flux (Wb).

Method Summary

static Unit	ATTO(Unit unit) Returns the specified unit multiplied by the factor 10-18
static Unit	CENTI(Unit unit) Returns the specified unit multiplied by the factor 10-2
static Unit	DECI(Unit unit) Returns the specified unit multiplied by the factor 10-1
static Unit	DEKA(Unit unit) Returns the specified unit multiplied by the factor 101
static Unit	EXA(Unit unit) Returns the specified unit multiplied by the factor 1018
static Unit	FEMTO(Unit unit) Returns the specified unit multiplied by the factor 10-15
static Unit	GIGA(Unit unit) Returns the specified unit multiplied by the factor 109
static Unit	HECTO(Unit unit) Returns the specified unit multiplied by the factor 102
static Unit	KILO(Unit unit) Returns the specified unit multiplied by the factor 103
static Unit	MEGA(Unit unit) Returns the specified unit multiplied by the factor 106
static Unit	MICRO(Unit unit) Returns the specified unit multiplied by the factor 10-6
static Unit	MILLI(Unit unit) Returns the specified unit multiplied by the factor 10-3
static Unit	NANO(Unit unit) Returns the specified unit multiplied by the factor 10-9
static Unit	PETA(Unit unit) Returns the specified unit multiplied by the factor 1015
static Unit	PICO(Unit unit) Returns the specified unit multiplied by the factor 10-12
static Unit	TERA(Unit unit) Returns the specified unit multiplied by the factor 1012
static Unit	YOCTO(Unit unit) Returns the specified unit multiplied by the factor 10-24
static Unit	YOTTA(Unit unit) Returns the specified unit multiplied by the factor 1024
static Unit	ZEPTO(Unit unit) Returns the specified unit multiplied by the factor 10-21
static Unit	ZETTA(Unit unit) Returns the specified unit multiplied by the factor 1021

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

AMPERE

public static final BaseUnit AMPERE

The base unit for electric current quantities (A). 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 metre apart in vacuum, would produce between these conductors a force equal to 2 × 10-7 newton per metre of length. It is named after the French physicist Andre Ampere (1775-1836).

CANDELA

public static final BaseUnit CANDELA

The base unit for luminous intensity quantities (cd). The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 × 1012 hertz and that has a radiant intensity in that direction of 1/683 watt per steradian

KELVIN

public static final BaseUnit KELVIN

The base unit for thermodynamic temperature quantities (K). The kelvin is the 1/273.16th of the thermodynamic temperature of the triple point of water. It is named after the Scottish mathematician and physicist William Thomson 1st Lord Kelvin (1824-1907)

KILOGRAM

public static final BaseUnit KILOGRAM

The base unit for mass quantities (kg). It is the only SI unit with a prefix as part of its name and symbol. The kilogram is equal to the mass of an international prototype in the form of a platinum-iridium cylinder kept at Sevres in France.

See Also:

GRAM

METER

public static final BaseUnit METER

The base unit for length quantities (m). One meter was redefined in 1983 as the distance traveled by light in a vacuum in 1/299,792,458 of a second.

MOLE

public static final BaseUnit MOLE

The base unit for amount of substance quantities (mol). 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

The base unit for duration quantities (s). It is defined as the duration of 9,192,631,770 cycles of radiation corresponding to the transition between two hyperfine levels of the ground state of cesium (1967 Standard).

GRAM

public static final Unit GRAM

The derived unit for mass quantities (g). The base unit for mass quantity is KILOGRAM.

RADIAN

public static final Unit RADIAN

The unit for plane angle quantities (rad). One radian is the angle between two radii of a circle such that the length of the arc between them is equal to the radius.

STERADIAN

public static final Unit STERADIAN

The unit for solid angle quantities (sr). One steradian is the solid angle subtended at the center of a sphere by an area on the surface of the sphere that is equal to the radius squared. The total solid angle of a sphere is 4*Pi steradians.

BIT

public static final Unit BIT

The unit for binary information (bit).

HERTZ

public static final Unit HERTZ

The derived unit for frequency (Hz). A unit of frequency equal to one cycle per second. After Heinrich Rudolf Hertz (1857-1894), German physicist who was the first to produce radio waves artificially.

NEWTON

public static final Unit NEWTON

The derived unit for force (N). One newton is the force required to give a mass of 1 kilogram an Force of 1 metre per second per second. It is named after the English mathematician and physicist Sir Isaac Newton (1642-1727).

PASCAL

public static final Unit PASCAL

The derived unit for pressure, stress (Pa). One pascal is equal to one newton per square meter. It is named after the French philosopher and mathematician Blaise Pascal (1623-1662).

JOULE

public static final Unit JOULE

The derived unit for energy, work, quantity of heat (J). One joule is the amount of work done when an applied force of 1 newton moves through a distance of 1 metre in the direction of the force. It is named after the English physicist James Prescott Joule (1818-1889).

WATT

public static final Unit WATT

The derived unit for power, radiant, flux (W). One watt is equal to one joule per second. It is named after the British scientist James Watt (1736-1819).

COULOMB

public static final Unit COULOMB

The derived unit for electric charge, quantity of electricity (C). One Coulomb is equal to the quantity of charge transferred in one second by a steady current of one ampere. It is named after the French physicist Charles Augustin de Coulomb (1736-1806).

VOLT

public static final Unit VOLT

The derived unit for electric potential difference, electromotive force (V). One Volt is equal to the difference of electric potential between two points on a conducting wire carrying a constant current of one ampere when the power dissipated between the points is one watt. It is named after the Italian physicist Count Alessandro Volta (1745-1827).

FARAD

public static final Unit FARAD

The derived unit for capacitance (F). One Farad is equal to the capacitance of a capacitor having an equal and opposite charge of 1 coulomb on each plate and a potential difference of 1 volt between the plates. It is named after the British physicist and chemist Michael Faraday (1791-1867).

OHM

public static final Unit OHM

The derived unit for electric resistance (Ω). One Ohm is equal to the resistance of a conductor in which a current of one ampere is produced by a potential of one volt across its terminals. It is named after the German physicist Georg Simon Ohm (1789-1854).

SIEMENS

public static final Unit SIEMENS

The derived unit for electric conductance (S). One Siemens is equal to one ampere per volt. It is named after the German engineer Ernst Werner von Siemens (1816-1892).

WEBER

public static final Unit WEBER

The derived unit for magnetic flux (Wb). One Weber is equal to the magnetic flux that in linking a circuit of one turn produces in it an electromotive force of one volt as it is uniformly reduced to zero within one second. It is named after the German physicist Wilhelm Eduard Weber (1804-1891).

TESLA

public static final Unit TESLA

The derived unit for magnetic flux density (T). One Tesla is equal equal to one weber per square meter. It is named after the Serbian-born American electrical engineer and physicist Nikola Tesla (1856-1943).

HENRY

public static final Unit HENRY

The derived unit for inductance (H). One Henry is equal to the inductance for which an induced electromotive force of one volt is produced when the current is varied at the rate of one ampere per second. It is named after the American physicist Joseph Henry (1791-1878).

CELSIUS

public static final Unit CELSIUS

The derived unit for Celsius temperature (°C). This is a unit of temperature such as the freezing point of water (at one atmosphere of pressure) is 0 °C, while the boiling point is 100 °C.

LUMEN

public static final Unit LUMEN

The derived unit for luminous flux (lm). One Lumen is equal to the amount of light given out through a solid angle by a source of one candela intensity radiating equally in all directions.

LUX

public static final Unit LUX

The derived unit for illuminance (lx). One Lux is equal to one lumen per square meter.

BECQUEREL

public static final Unit BECQUEREL

The derived unit for activity of a radionuclide (Bq). One becquerel is the radiation caused by one disintegration per second. It is named after the French physicist, Antoine-Henri Becquerel (1852-1908).

GRAY

public static final Unit GRAY

The derived unit for absorbed dose, specific energy (imparted), kerma (Gy). One gray is equal to the dose of one joule of energy absorbed per one kilogram of matter. It is named after the British physician L. H. Gray (1905-1965).

SIEVERT

public static final Unit SIEVERT

The derived unit for dose equivalent (Sv). One Sievert is equal is equal to the actual dose, in grays, multiplied by a "quality factor" which is larger for more dangerous forms of radiation. It is named after the Swedish physicist Rolf Sievert (1898-1966).

KATAL

public static final Unit KATAL

The derived unit for catalytic activity (kat).

Method Detail

YOTTA

public static Unit YOTTA(Unit unit)

Returns the specified unit multiplied by the factor 1024

Parameters:

unit - any unit.

Returns:

unit.multiply(1e24).

ZETTA

public static Unit ZETTA(Unit unit)

Returns the specified unit multiplied by the factor 1021

Parameters:

unit - any unit.

Returns:

unit.multiply(1e21).

EXA

public static Unit EXA(Unit unit)

Returns the specified unit multiplied by the factor 1018

Parameters:

unit - any unit.

Returns:

unit.multiply(1e18).

PETA

public static Unit PETA(Unit unit)

Returns the specified unit multiplied by the factor 1015

Parameters:

unit - any unit.

Returns:

unit.multiply(1e15).

TERA

public static Unit TERA(Unit unit)

Returns the specified unit multiplied by the factor 1012

Parameters:

unit - any unit.

Returns:

unit.multiply(1e12).

GIGA

public static Unit GIGA(Unit unit)

Returns the specified unit multiplied by the factor 109

Parameters:

unit - any unit.

Returns:

unit.multiply(1e9).

MEGA

public static Unit MEGA(Unit unit)

Returns the specified unit multiplied by the factor 106

Parameters:

unit - any unit.

Returns:

unit.multiply(1e6).

KILO

public static Unit KILO(Unit unit)

Returns the specified unit multiplied by the factor 103

Parameters:

unit - any unit.

Returns:

unit.multiply(1e3).

HECTO

public static Unit HECTO(Unit unit)

Returns the specified unit multiplied by the factor 102

Parameters:

unit - any unit.

Returns:

unit.multiply(1e2).

DEKA

public static Unit DEKA(Unit unit)

Returns the specified unit multiplied by the factor 101

Parameters:

unit - any unit.

Returns:

unit.multiply(1e1).

DECI

public static Unit DECI(Unit unit)

Returns the specified unit multiplied by the factor 10-1

Parameters:

unit - any unit.

Returns:

unit.multiply(1e-1).

CENTI

public static Unit CENTI(Unit unit)

Returns the specified unit multiplied by the factor 10-2

Parameters:

unit - any unit.

Returns:

unit.multiply(1e-2).

MILLI

public static Unit MILLI(Unit unit)

Returns the specified unit multiplied by the factor 10-3

Parameters:

unit - any unit.

Returns:

unit.multiply(1e-3).

MICRO

public static Unit MICRO(Unit unit)

Returns the specified unit multiplied by the factor 10-6

Parameters:

unit - any unit.

Returns:

unit.multiply(1e-6).

NANO

public static Unit NANO(Unit unit)

Returns the specified unit multiplied by the factor 10-9

Parameters:

unit - any unit.

Returns:

unit.multiply(1e-9).

PICO

public static Unit PICO(Unit unit)

Returns the specified unit multiplied by the factor 10-12

Parameters:

unit - any unit.

Returns:

unit.multiply(1e-12).

FEMTO

public static Unit FEMTO(Unit unit)

Returns the specified unit multiplied by the factor 10-15

Parameters:

unit - any unit.

Returns:

unit.multiply(1e-15).

ATTO

public static Unit ATTO(Unit unit)

Returns the specified unit multiplied by the factor 10-18

Parameters:

unit - any unit.

Returns:

unit.multiply(1e-18).

ZEPTO

public static Unit ZEPTO(Unit unit)

Returns the specified unit multiplied by the factor 10-21

Parameters:

unit - any unit.

Returns:

unit.multiply(1e-21).

YOCTO

public static Unit YOCTO(Unit unit)

Returns the specified unit multiplied by the factor 10-24

Parameters:

unit - any unit.

Returns:

unit.multiply(1e-24).