Class Constants
java.lang.Object
org.djunits.value.vdouble.scalar.base.Constants
Various physical constants. For many, see Wikipedia 2019 redefinition of the SI base units
- Author:
- Peter Knoppers
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Field Summary
Modifier and TypeFieldDescriptionstatic final SIScalar
Number of constituent particles in a Mole; a.k.a.static final SIScalar
Boltzmann constant in Joule per Kelvin (this value is exact since the 2019 redefinition of SI base units).static final Frequency
The Cesium 133 ground state hyperfine structure transition frequency.static final Dimensionless
Euler's constant.static final ElectricalCharge
Electrical charge of one electron.static final Mass
Mass of an electron.static final SIScalar
Gravitational constant, a.k.a.static final Speed
Speed of light in vacuum.static final SIScalar
The luminous efficacy Kcd of monochromatic radiation of frequency 540×10^12 Hz (540 THz).static final Mass
Mass of a neutron.static final Dimensionless
Golden ratio.static final Dimensionless
Ratio of a half circumference of a circle and its radius.static final SIScalar
Planck constant; ratio of a photon's energy and its frequency.static final SIScalar
Reduced Planck constant, a.k.a. angular Planck constant; Planck constant divided by 2 pi.static final ElectricalCharge
ElectricalCharge of one proton.static final Mass
Mass of a proton.static final Dimensionless
Ratio of circumference of circle and its radius.static final SIScalar
Impedance of vacuum.static final SIScalar
Permeability of vacuum.static final SIScalar
Permittivity of vacuum. -
Method Summary
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Field Details
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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 2.8e-40 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 9.5e-37 kg. -
PROTONMASS
Mass of a proton. See Wikipedia Physical constant. This value of this physical constant has an uncertainty of 5.1e-37. -
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
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 1.9e-16N/A^2. -
VACUUMPERMITTIVITY
Permittivity of vacuum. See Wikipedia Vacuum permittivity. The uncertainty of this value is 1.3e-21 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 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. -
PI
Ratio of a half circumference of a circle and its radius. -
TAU
Ratio of circumference of circle and its radius. -
E
Euler's constant. -
PHI
Golden ratio. -
PLANCKREDUCED
Reduced Planck constant, a.k.a. angular Planck constant; Planck constant divided by 2 pi.
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