Package javax.measure.unit

Class SI

java.lang.Object
javax.measure.unit.SystemOfUnits
javax.measure.unit.SI
public final class SI extends SystemOfUnits

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. For example:[code] import static org.jscience.physics.units.SI.*; // Static import. ... Unit HECTO_PASCAL = HECTO(PASCAL); Unit KILO_METER = KILO(METER); [/code]

See Also:

  • Field Details

    • AMPERE

      public static final BaseUnit<ElectricCurrent> 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<LuminousIntensity> 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
      See Also:

    • KELVIN

      public static final BaseUnit<Temperature> 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<Mass> 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:

    • METRE

      public static final BaseUnit<Length> METRE
      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.

    • METER

      public static final Unit<Length> METER
      Equivalent to METRE (American spelling).

    • MOLE

      public static final BaseUnit<AmountOfSubstance> 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<Duration> 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<Mass> GRAM
      The derived unit for mass quantities (g). The base unit for mass quantity is KILOGRAM.

    • RADIAN

      public static final AlternateUnit<Angle> 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 AlternateUnit<SolidAngle> 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 AlternateUnit<DataAmount> BIT
      The unit for binary information (bit).

    • HERTZ

      public static final AlternateUnit<Frequency> 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 AlternateUnit<Force> 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 AlternateUnit<Pressure> 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 AlternateUnit<Energy> 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 AlternateUnit<Power> 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 AlternateUnit<ElectricCharge> 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 AlternateUnit<ElectricPotential> 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 AlternateUnit<ElectricCapacitance> 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 AlternateUnit<ElectricResistance> OHM
      The derived unit for electric resistance (Ω or Ohm). 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 AlternateUnit<ElectricConductance> 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 AlternateUnit<MagneticFlux> 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 AlternateUnit<MagneticFluxDensity> 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 AlternateUnit<ElectricInductance> 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<Temperature> CELSIUS
      The derived unit for Celsius temperature (℃). This is a unit of temperature such as the freezing point of water (at one atmosphere of pressure) is 0 ℃, while the boiling point is 100 ℃.

    • LUMEN

      public static final AlternateUnit<LuminousFlux> 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 AlternateUnit<Illuminance> LUX
      The derived unit for illuminance (lx). One Lux is equal to one lumen per square meter.

    • BECQUEREL

      public static final AlternateUnit<RadioactiveActivity> 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 AlternateUnit<RadiationDoseAbsorbed> 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 AlternateUnit<RadiationDoseEffective> 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 AlternateUnit<CatalyticActivity> KATAL
      The derived unit for catalytic activity (kat).

    • METRES_PER_SECOND

      public static final Unit<Velocity> METRES_PER_SECOND
      The metric unit for velocity quantities (m/s).

    • METERS_PER_SECOND

      public static final Unit<Velocity> METERS_PER_SECOND
      Equivalent to METRES_PER_SECOND.

    • METRES_PER_SQUARE_SECOND

      public static final Unit<Acceleration> METRES_PER_SQUARE_SECOND
      The metric unit for acceleration quantities (m/s²).

    • METERS_PER_SQUARE_SECOND

      public static final Unit<Acceleration> METERS_PER_SQUARE_SECOND
      Equivalent to METRES_PER_SQUARE_SECOND.

    • SQUARE_METRE

      public static final Unit<Area> SQUARE_METRE
      The metric unit for area quantities (m²).

    • CUBIC_METRE

      public static final Unit<Volume> CUBIC_METRE
      The metric unit for volume quantities (m³).

    • KILOMETRE

      public static final Unit<Length> KILOMETRE
      Equivalent to KILO(METRE).

    • KILOMETER

      public static final Unit<Length> KILOMETER
      Equivalent to KILOMETRE.

    • CENTIMETRE

      public static final Unit<Length> CENTIMETRE
      Equivalent to CENTI(METRE).

    • CENTIMETER

      public static final Unit<Length> CENTIMETER
      Equivalent to CENTIMETRE.

    • MILLIMETRE

      public static final Unit<Length> MILLIMETRE
      Equivalent to MILLI(METRE).

    • MILLIMETER

      public static final Unit<Length> MILLIMETER
      Equivalent to MILLIMETRE.

    • METRE_PER_SECOND

      public static final Unit<Velocity> METRE_PER_SECOND
      Deprecated.
      replaced by METRES_PER_SECOND.

    • METRE_PER_SQUARE_SECOND

      public static final Unit<Acceleration> METRE_PER_SQUARE_SECOND
      Deprecated.
      replaced by METRES_PER_SQUARE_SECOND.

  • Method Details

    • getInstance

      public static SI getInstance()
      Returns the unique instance of this class.
      Returns:
      the SI instance.

    • YOTTA

      public static <Q extends Quantity> Unit<Q> YOTTA(Unit<Q> unit)
      Returns the specified unit multiplied by the factor 1024
      Parameters:
      unit - any unit.
      Returns:
      unit.multiply(1e24).

    • ZETTA

      public static <Q extends Quantity> Unit<Q> ZETTA(Unit<Q> unit)
      Returns the specified unit multiplied by the factor 1021
      Parameters:
      unit - any unit.
      Returns:
      unit.multiply(1e21).

    • EXA

      public static <Q extends Quantity> Unit<Q> EXA(Unit<Q> unit)
      Returns the specified unit multiplied by the factor 1018
      Parameters:
      unit - any unit.
      Returns:
      unit.multiply(1e18).

    • PETA

      public static <Q extends Quantity> Unit<Q> PETA(Unit<Q> unit)
      Returns the specified unit multiplied by the factor 1015
      Parameters:
      unit - any unit.
      Returns:
      unit.multiply(1e15).

    • TERA

      public static <Q extends Quantity> Unit<Q> TERA(Unit<Q> unit)
      Returns the specified unit multiplied by the factor 1012
      Parameters:
      unit - any unit.
      Returns:
      unit.multiply(1e12).

    • GIGA

      public static <Q extends Quantity> Unit<Q> GIGA(Unit<Q> unit)
      Returns the specified unit multiplied by the factor 109
      Parameters:
      unit - any unit.
      Returns:
      unit.multiply(1e9).

    • MEGA

      public static <Q extends Quantity> Unit<Q> MEGA(Unit<Q> unit)
      Returns the specified unit multiplied by the factor 106
      Parameters:
      unit - any unit.
      Returns:
      unit.multiply(1e6).

    • KILO

      public static <Q extends Quantity> Unit<Q> KILO(Unit<Q> unit)
      Returns the specified unit multiplied by the factor 103
      Parameters:
      unit - any unit.
      Returns:
      unit.multiply(1e3).

    • HECTO

      public static <Q extends Quantity> Unit<Q> HECTO(Unit<Q> unit)
      Returns the specified unit multiplied by the factor 102
      Parameters:
      unit - any unit.
      Returns:
      unit.multiply(1e2).

    • DEKA

      public static <Q extends Quantity> Unit<Q> DEKA(Unit<Q> unit)
      Returns the specified unit multiplied by the factor 101
      Parameters:
      unit - any unit.
      Returns:
      unit.multiply(1e1).

    • DECI

      public static <Q extends Quantity> Unit<Q> DECI(Unit<Q> unit)
      Returns the specified unit multiplied by the factor 10-1
      Parameters:
      unit - any unit.
      Returns:
      unit.multiply(1e-1).

    • CENTI

      public static <Q extends Quantity> Unit<Q> CENTI(Unit<Q> unit)
      Returns the specified unit multiplied by the factor 10-2
      Parameters:
      unit - any unit.
      Returns:
      unit.multiply(1e-2).

    • MILLI

      public static <Q extends Quantity> Unit<Q> MILLI(Unit<Q> unit)
      Returns the specified unit multiplied by the factor 10-3
      Parameters:
      unit - any unit.
      Returns:
      unit.multiply(1e-3).

    • MICRO

      public static <Q extends Quantity> Unit<Q> MICRO(Unit<Q> unit)
      Returns the specified unit multiplied by the factor 10-6
      Parameters:
      unit - any unit.
      Returns:
      unit.multiply(1e-6).

    • NANO

      public static <Q extends Quantity> Unit<Q> NANO(Unit<Q> unit)
      Returns the specified unit multiplied by the factor 10-9
      Parameters:
      unit - any unit.
      Returns:
      unit.multiply(1e-9).

    • PICO

      public static <Q extends Quantity> Unit<Q> PICO(Unit<Q> unit)
      Returns the specified unit multiplied by the factor 10-12
      Parameters:
      unit - any unit.
      Returns:
      unit.multiply(1e-12).

    • FEMTO

      public static <Q extends Quantity> Unit<Q> FEMTO(Unit<Q> unit)
      Returns the specified unit multiplied by the factor 10-15
      Parameters:
      unit - any unit.
      Returns:
      unit.multiply(1e-15).

    • ATTO

      public static <Q extends Quantity> Unit<Q> ATTO(Unit<Q> unit)
      Returns the specified unit multiplied by the factor 10-18
      Parameters:
      unit - any unit.
      Returns:
      unit.multiply(1e-18).

    • ZEPTO

      public static <Q extends Quantity> Unit<Q> ZEPTO(Unit<Q> unit)
      Returns the specified unit multiplied by the factor 10-21
      Parameters:
      unit - any unit.
      Returns:
      unit.multiply(1e-21).

    • YOCTO

      public static <Q extends Quantity> Unit<Q> YOCTO(Unit<Q> unit)
      Returns the specified unit multiplied by the factor 10-24
      Parameters:
      unit - any unit.
      Returns:
      unit.multiply(1e-24).

    • getUnits

      public Set<Unit<?>> getUnits()
      Returns a read only view over theunits defined in this class.
      Specified by:
      getUnits in class SystemOfUnits
      Returns:
      the collection of SI units.