//
// SI.java
//
/*
VisAD system for interactive analysis and visualization of numerical
data. Copyright (C) 1996 - 2017 Bill Hibbard, Curtis Rueden, Tom
Rink, Dave Glowacki, Steve Emmerson, Tom Whittaker, Don Murray, and
Tommy Jasmin.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA
*/
package visad;
import java.io.Serializable;
/**
* A class that represents the SI system of units.
*
* @author Steven R. Emmerson
*
* This is part of Steve Emerson's Unit package that has been
* incorporated into VisAD.
*/
public final class SI
implements Serializable
{
/*
* The base units of the SI system of units:
*/
/**
* 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.
*/
public static /*final*/ BaseUnit ampere;
/**
* 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.
*/
public static /*final*/ BaseUnit candela;
/**
* 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.
*/
public static /*final*/ BaseUnit kelvin;
/**
* Base unit of mass.
* The kilogram is the unit of mass; it is equal to the mass
* of the international prototype of the kilogram.
*/
public static /*final*/ BaseUnit kilogram;
/**
* 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.
*/
public static /*final*/ BaseUnit meter;
/**
* 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.
*/
public static /*final*/ BaseUnit second;
/**
* 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.
*/
public static /*final*/ BaseUnit mole;
/**
* 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. This unit is dimensionless.
*/
public static /*final*/ BaseUnit radian;
/**
* 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 of the surface
* equal to that of a square with sides of length equal to the
* radius of the sphere. This unit is dimensionless.
*/
public static /*final*/ BaseUnit steradian;
static
{
try
{
/**
* 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.
*/
ampere = BaseUnit.addBaseUnit("ElectricCurrent", "ampere", "A");
/**
* 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.
*/
candela =
BaseUnit.addBaseUnit("LuminousIntensity", "candela", "cd");
/**
* 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.
*/
kelvin = BaseUnit.addBaseUnit("Temperature", "kelvin", "K");
/**
* Base unit of mass.
* The kilogram is the unit of mass; it is equal to the mass
* of the international prototype of the kilogram.
*/
kilogram = BaseUnit.addBaseUnit("Mass", "kilogram", "kg");
/**
* 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.
*/
meter = BaseUnit.addBaseUnit("Length", "meter", "m");
/**
* 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.
*/
second = BaseUnit.addBaseUnit("Time", "second", "s");
/**
* 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.
*/
mole = BaseUnit.addBaseUnit("AmountOfSubstance", "mole", "mol");
/**
* 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. This unit is dimensionless.
*/
radian = BaseUnit.addBaseUnit("Angle", "radian", "rad", true);
/**
* 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 of the surface
* equal to that of a square with sides of length equal to the
* radius of the sphere. This unit is dimensionless.
*/
steradian =
BaseUnit.addBaseUnit("SolidAngle", "steradian", "sr", true);
}
catch (UnitException e) {}
}
private SI() {
}
/**
* Test this class.
*
* @param args Arguments (ignored).
*/
public static void main (String[] args)
{
System.out.println("ampere = \"" + ampere + "\"");
System.out.println("candela = \"" + candela + "\"");
System.out.println("kelvin = \"" + kelvin + "\"");
System.out.println("kilogram = \"" + kilogram + "\"");
System.out.println("meter = \"" + meter + "\"");
System.out.println("second = \"" + second + "\"");
System.out.println("mole = \"" + mole + "\"");
System.out.println("radian = \"" + radian + "\"");
System.out.println("steradian = \"" + steradian + "\"");
}
}
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