Package org.djunits.value.vdouble.scalar.base

Class Constants

java.lang.Object

org.djunits.value.vdouble.scalar.base.Constants

public final class Constants
extends Object

Various physical constants. For many, see Wikipedia 2019 redefinition of the SI base units

Author:

Peter Knoppers

Field Summary

Fields

Modifier and Type	Field	Description
static SIScalar	AVOGADRO	Number of constituent particles in a Mole; a.k.a.
static SIScalar	BOLTZMANN	Boltzmann constant in Joule per Kelvin (this value is exact since the 2019 redefinition of SI base units).
static Frequency	CESIUM133_FREQUENCY	The Cesium 133 ground state hyperfine structure transition frequency.
static ElectricalCharge	ELECTRONCHARGE	Electrical charge of one electron.
static Mass	ELECTRONMASS	Mass of an electron.
static SIScalar	G	Gravitational constant, a.k.a.
static Speed	LIGHTSPEED	Speed of light in vacuum.
static SIScalar	LUMINOUS_EFFICACY_540THZ	The luminous efficacy Kcd of monochromatic radiation of frequency 540×10^12 Hz (540 THz).
static Mass	NEUTRONMASS	Mass of a neutron.
static SIScalar	PLANCK	Planck constant; ratio of a photon's energy and its frequency.
static SIScalar	PLANKREDUCED	Reduced Planck constant, a.k.a.
static ElectricalCharge	PROTONCHARGE	ElectricalCharge of one proton.
static Mass	PROTONMASS	Mass of a proton.
static Dimensionless	TAU	Ratio of circumference of circle and its radius.
static SIScalar	VACUUMIMPEDANCE	Impedance of vacuum.
static SIScalar	VACUUMPERMEABILITY	Permeability of vacuum.
static SIScalar	VACUUMPERMITTIVITY	Permittivity of vacuum.

Method Summary

Methods inherited from class java.lang.Object

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

Field Detail

AVOGADRO

public static final SIScalar AVOGADRO

Number of constituent particles in a Mole; a.k.a. Avogadro's number. This value is exact since the 2019 redefinition of the SI base units.

BOLTZMANN

public static final SIScalar BOLTZMANN

Boltzmann constant in Joule per Kelvin (this value is exact since the 2019 redefinition of SI base units). See Wikipedia: Boltzmann constant

CESIUM133_FREQUENCY

public static final Frequency CESIUM133_FREQUENCY

The Cesium 133 ground state hyperfine structure transition frequency. This value is exact since the 2006 redefinition of the SI base units.

ELECTRONCHARGE

public static final ElectricalCharge ELECTRONCHARGE

Electrical charge of one electron. This value is exact since the 2019 redefinition of the SI base units.

ELECTRONMASS

public static final Mass ELECTRONMASS

Mass of an electron. See Wikipedia Physical constant. This value of this physical constant has an uncertainty of 2.8e-40 kg.

PROTONCHARGE

public static final ElectricalCharge PROTONCHARGE

ElectricalCharge of one proton.

NEUTRONMASS

public static final Mass NEUTRONMASS

Mass of a neutron. See Wikipedia List of physical constants. This value of this physical constant has an uncertainty of 9.5e-37 kg.

PROTONMASS

public static final Mass PROTONMASS

Mass of a proton. See Wikipedia Physical constant. This value of this physical constant has an uncertainty of 5.1e-37.

G

public static final SIScalar G

Gravitational constant, a.k.a. Newtonian constant of gravitation. This is the 2018 best known approximation, which has an uncertainty 1.5e-15 m^3/kgs^2

LIGHTSPEED

public static final Speed LIGHTSPEED

Speed of light in vacuum. This value is exact (since the 2006 redefinition of the SI base units).

VACUUMPERMEABILITY

public static final SIScalar VACUUMPERMEABILITY

Permeability of vacuum. See Wikipedia, Vacuum permeability. The uncertainty of this value is 1.9e-16N/A^2.

VACUUMPERMITTIVITY

public static final SIScalar VACUUMPERMITTIVITY

Permittivity of vacuum. See Wikipedia Vacuum permittivity. The uncertainty of this value is 1.3e-21 F/m.

VACUUMIMPEDANCE

public static final SIScalar VACUUMIMPEDANCE

Impedance of vacuum.

PLANCK

public static final SIScalar PLANCK

Planck constant; ratio of a photon's energy and its frequency. This value is exact since the 2019 redefinition of the SI base units.

LUMINOUS_EFFICACY_540THZ

public static final SIScalar LUMINOUS_EFFICACY_540THZ

The luminous efficacy Kcd of monochromatic radiation of frequency 540×10^12 Hz (540 THz). This is the frequency of a green-colored light at approximately the peak sensitivity of the human eye. This value is exact since the 2006 redefinition of the SI base units.

TAU

public static final Dimensionless TAU

Ratio of circumference of circle and its radius.

PLANKREDUCED

public static final SIScalar PLANKREDUCED

Reduced Planck constant, a.k.a. angular Planck constant; Planck constant divided by 2 pi.