org.jscience.physics.measures
Class Constants

java.lang.Object
  org.jscience.physics.measures.Constants

public final class Constants
extends java.lang.Object

This class provides most accurate physical constants measures; the more accurate the constants, the higher the precision of the calculations making use of these constants.

Constant names use the full range of Unicode characters and are mixed uppercase/lowercase to resemble symbolic names as much as possible

Reference: CODATA Internationally recommended values of the Fundamental Physical Constants (2002)

Version:

3.1, April 7, 2006

Author:

Jean-Marie Dautelle

Field Summary

static Measure<?>	µ0 Holds the permeability of vacuum or magnetic constant.
static Measure<?>	µB Holds the Bohr magneton (ℏ·e/2me)
static Measure<?>	µN Holds the nuclear magneton (ℏ·e/2mp)
static Measure<Length>	a0 Holds the Bohr radius (α/(4π·Rinf))
static Measure<Mass>	amu Holds the unified atomic mass unit (0.001 kg/mol)/N
static Measure<Velocity>	c Holds the speed of light in vacuum (exact).
static Measure<?>	c_square Holds c².
static Measure<ElectricCharge>	e Holds the elementary charge (positron charge).
static Measure<?>	Eh Holds the Hartree energy (2Rinf·h·c)
static Measure<?>	F Holds the Faraday constant (N·e)
static Measure<Dimensionless>	four_π Holds 4·π.
static Measure<Acceleration>	g Holds the standard acceleration due to gravity (approximately equal to the acceleration due to gravity on the Earth's surface).
static Measure<?>	G Holds the Newtonian constant of gravitation.
static Measure<ElectricConductance>	G0 Holds the conductance quantum (2e²/h)
static Measure<Dimensionless>	half_π Holds π/2.
static Measure<?>	k Holds the Boltzmann constant.
static Measure<Length>	lP Holds the Planck length (ℏ/(mP·c))
static Measure<Mass>	md Holds the deuteron rest mass.
static Measure<Mass>	me Holds the electron rest mass.
static Measure<Mass>	mn Holds the neutron rest mass.
static Measure<Mass>	mp Holds the proton rest mass.
static Measure<Mass>	mP Holds the Planck mass (ℏ·c/G)1/2
static Measure<Mass>	mμ Holds the muon rest mass.
static Measure<?>	N Holds the Avogadro constant.
static Measure<?>	R Holds the molar gas constant (N·k)
static Measure<?>	Rinf Holds the Rydberg constant (α²·me·c/2h).
static Measure<Duration>	tP Holds the Planck time (lP/c)
static Measure<Dimensionless>	two_π Holds 2·π.
static Measure<ElectricResistance>	Z0 Holds the characteristic impedance of vacuum (µ0·c).
static Measure<MagneticFlux>	Φ0 Holds the magnetic flux quantum (h/2e)
static Measure<Dimensionless>	α Holds the fine structure constant (e²/(2·ε0·c·h))
static Measure<?>	ε0 Holds the permittivity of vacuum or electric constant (1/(µ0·c²))
static Measure<Dimensionless>	π Holds the ratio of the circumference of a circle to its diameter.
static Measure<Dimensionless>	π_square Holds π².
static Measure<?>	σ Holds the Stefan-Boltzmann constant ((π²/60)·k4/(ℏ³·c²))
static Measure<?>	ℎ Holds the Planck constant.
static Measure<?>	ℏ Holds the Planck constant over 2π.

Method Summary

Methods inherited from class java.lang.Object

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

Field Detail

g

public static final Measure<Acceleration> g

Holds the standard acceleration due to gravity (approximately equal to the acceleration due to gravity on the Earth's surface).

See Also:

Wikipedia: Acceleration due to gravity

me

public static final Measure<Mass> me

Holds the electron rest mass.

mp

public static final Measure<Mass> mp

Holds the proton rest mass.

mn

public static final Measure<Mass> mn

Holds the neutron rest mass.

md

public static final Measure<Mass> md

Holds the deuteron rest mass.

mμ

public static final Measure<Mass> mμ

Holds the muon rest mass.

π

public static final Measure<Dimensionless> π

Holds the ratio of the circumference of a circle to its diameter.

half_π

public static final Measure<Dimensionless> half_π

Holds π/2.

two_π

public static final Measure<Dimensionless> two_π

Holds 2·π.

four_π

public static final Measure<Dimensionless> four_π

Holds 4·π.

π_square

public static final Measure<Dimensionless> π_square

Holds π².

c

public static final Measure<Velocity> c

Holds the speed of light in vacuum (exact).

c_square

public static final Measure<?> c_square

Holds c².

k

public static final Measure<?> k

Holds the Boltzmann constant.

See Also:

Wikipedia: Boltzmann constant

ℎ

public static final Measure<?> ℎ

Holds the Planck constant.

See Also:

Wikipedia: Plank's constant

ℏ

public static final Measure<?> ℏ

Holds the Planck constant over 2π.

e

public static final Measure<ElectricCharge> e

Holds the elementary charge (positron charge).

See Also:

Wikipedia: Elementary Charge

µ0

public static final Measure<?> µ0

Holds the permeability of vacuum or magnetic constant.

See Also:

Wikipedia: Permeability (electromagnetism)

ε0

public static final Measure<?> ε0

Holds the permittivity of vacuum or electric constant (1/(µ0·c²))

See Also:

Wikipedia: Permittivity

Z0

public static final Measure<ElectricResistance> Z0

Holds the characteristic impedance of vacuum (µ0·c).

α

public static final Measure<Dimensionless> α

Holds the fine structure constant (e²/(2·ε0·c·h))

See Also:

Wikipedia: Fine Structure Constant

G

public static final Measure<?> G

Holds the Newtonian constant of gravitation.

See Also:

Wikipedia: Gravitational Constant

N

public static final Measure<?> N

Holds the Avogadro constant.

See Also:

Wikipedia: Avogadro's number

R

public static final Measure<?> R

Holds the molar gas constant (N·k)

See Also:

Wikipedia: Gas constant

F

public static final Measure<?> F

Holds the Faraday constant (N·e)

See Also:

Wikipedia: Faraday constant

σ

public static final Measure<?> σ

Holds the Stefan-Boltzmann constant ((π²/60)·k⁴/(ℏ³·c²))

amu

public static final Measure<Mass> amu

Holds the unified atomic mass unit (0.001 kg/mol)/N

Rinf

public static final Measure<?> Rinf

Holds the Rydberg constant (α²·me·c/2h).

See Also:

Wikipedia: Rydberg constant

a0

public static final Measure<Length> a0

Holds the Bohr radius (α/(4π·Rinf))

Eh

public static final Measure<?> Eh

Holds the Hartree energy (2Rinf·h·c)

Φ0

public static final Measure<MagneticFlux> Φ0

Holds the magnetic flux quantum (h/2e)

G0

public static final Measure<ElectricConductance> G0

Holds the conductance quantum (2e²/h)

µB

public static final Measure<?> µB

Holds the Bohr magneton (ℏ·e/2me)

µN

public static final Measure<?> µN

Holds the nuclear magneton (ℏ·e/2mp)

mP

public static final Measure<Mass> mP

Holds the Planck mass (ℏ·c/G)^1/2

lP

public static final Measure<Length> lP

Holds the Planck length (ℏ/(mP·c))

tP

public static final Measure<Duration> tP

Holds the Planck time (lP/c)