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

Field Details

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
Boltzmann constant in Joule per Kelvin (this value is exact since the 2019 redefinition of SI base units). See Wikipedia: Boltzmann constant 
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
Electrical charge of one electron. This value is exact since the 2019 redefinition of the SI base units. 
ELECTRONMASS
Mass of an electron. See Wikipedia Physical constant. This value of this physical constant has an uncertainty of 2.8e40 kg. 
PROTONCHARGE
ElectricalCharge of one proton. 
NEUTRONMASS
Mass of a neutron. See Wikipedia List of physical constants. This value of this physical constant has an uncertainty of 9.5e37 kg. 
PROTONMASS
Mass of a proton. See Wikipedia Physical constant. This value of this physical constant has an uncertainty of 5.1e37. 
G
Gravitational constant, a.k.a. Newtonian constant of gravitation. This is the 2018 best known approximation, which has an uncertainty 1.5e15 m^3/kgs^2 
LIGHTSPEED
Speed of light in vacuum. This value is exact (since the 2006 redefinition of the SI base units). 
VACUUMPERMEABILITY
Permeability of vacuum. See Wikipedia, Vacuum permeability. The uncertainty of this value is 1.9e16N/A^2. 
VACUUMPERMITTIVITY
Permittivity of vacuum. See Wikipedia Vacuum permittivity. The uncertainty of this value is 1.3e21 F/m. 
VACUUMIMPEDANCE
Impedance of vacuum. 
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
The luminous efficacy Kcd of monochromatic radiation of frequency 540×10^12 Hz (540 THz). This is the frequency of a greencolored light at approximately the peak sensitivity of the human eye. This value is exact since the 2006 redefinition of the SI base units. 
TAU
Ratio of circumference of circle and its radius. 
PLANKREDUCED
Reduced Planck constant, a.k.a. angular Planck constant; Planck constant divided by 2 pi.
