DEFINE command

Syntax: DEFINE
Qualifiers: /CONSTANTS
Defaults: /CONSTANTS

The DEFINE command, with no qualifiers or with the \CONSTANTS qualifier, defines many mathematical and physical constants as scalar variables.

Name Value Description
ALPHAMASS6.64465598e-27alpha particle mass (kg)
ALPHAMASSMEV3727.37904alpha particle mass (MeV)
AVOGADRO6.02214199e23Avogadro's constant (1/mol)
BOHRRADIUS0.5291772083e-10Bohr radius (m)
BOLTZMANN1.3806503e-23Boltzmann constant (J/K)
ELECTRONRADIUS2.817940285e-15classical electron radius (m)
COMPTON2.426310215e-12Compton wavelength (m)
DEUTERONMASS3.34358309e-27deuteron particle mass (kg)
DEUTERONMASSMEV1875.612762deuteron particle mass (MeV)
ELECTRONMASS9.10938188e-31electron particle mass (kg)
ELECTRONMASSMEV0.510998902electron particle mass (MeV)
ELECTRONVOLT1.602176462e-19electron volt (J)
ELECTRONCHARGE1.602176462e-19charge on electron (C)
FARADAY96485.3415Faraday constant (C/mol)
FERMICOUPLING1.16639e-5Fermi coupling constant (1/GeV2)
FINESTRUCTURE7.297352533e-3fine-structure constant ()
MAGNETIC12.566370614e-7magnetic constant (N/A2)
NEUTRONMASS1.67492716e-27neutron particle mass (kg)
NEUTRONMASSMEV939.565330neutron particle mass (MeV)
GRAVITATION6.673e-11Newtonian constant of gravitation (m3/kg/s2)
PLANCK6.62606876e-34Planck's constant (J s)
HBAR1.05457266e-34Planck's constant, reduced (J s)
PROTONMASS1.67262158e-27proton particle mass (kg)
PROTONMASSMEV938.271998proton particle mass (MeV)
RYDBERG10973731.568549Rydberg constant (1/m)
LIGHTSPEED299792458speed of light in a vacuum (m/s)
GRAVITYACC9.80665standard acceleration of gravity (m/s2)
ATMOSPHERE101325standard atmosphere (Pa)
STEFANBOLTZMANN5.670400e-8Stefan-Boltzmann constant (W/m2/K4)
THOMSON0.665245854e-28Thomson cross section (m2)
AMASS1.66053873e-27unified atomic mass unit (kg)
PI3.14159265358979323846pi
EARTHRADIUS6.378140e6radius of the earth at the equator (m)
AU1.4959787066e11astronomical unit (m)
EARTHMASS5.97370e24mass of the earth (kg)
E2.718281828459045235natural logarithm base
PARSEC3.0856775807e16parsec (m)
SUNMASS1.98892e30mass of the sun (kg)
SUNRADIUS6.96e8radius of the sun at the equator (m)