Package javax.measure.unit

Class 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:
    Wikipedia: SI, Wikipedia: SI prefix

    • Field Detail

      • 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:
        Wikipedia: Candela

      • 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:
        GRAM

      • 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.

      • 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).

      • METRES_PER_SECOND

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

      • METRES_PER_SQUARE_SECOND

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

      • 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).

      • CENTIMETRE

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

      • MILLIMETRE

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

    • Method Detail

      • 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.