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 |
| ALPHAMASS | 6.64465598e-27 | alpha particle mass (kg) |
| ALPHAMASSMEV | 3727.37904 | alpha particle mass (MeV) |
| AVOGADRO | 6.02214199e23 | Avogadro's constant (1/mol) |
| BOHRRADIUS | 0.5291772083e-10 | Bohr radius (m) |
| BOLTZMANN | 1.3806503e-23 | Boltzmann constant (J/K) |
| ELECTRONRADIUS | 2.817940285e-15 | classical electron radius (m) |
| COMPTON | 2.426310215e-12 | Compton wavelength (m) |
| DEUTERONMASS | 3.34358309e-27 | deuteron particle mass (kg) |
| DEUTERONMASSMEV | 1875.612762 | deuteron particle mass (MeV) |
| ELECTRONMASS | 9.10938188e-31 | electron particle mass (kg) |
| ELECTRONMASSMEV | 0.510998902 | electron particle mass (MeV) |
| ELECTRONVOLT | 1.602176462e-19 | electron volt (J) |
| ELECTRONCHARGE | 1.602176462e-19 | charge on electron (C) |
| FARADAY | 96485.3415 | Faraday constant (C/mol) |
| FERMICOUPLING | 1.16639e-5 | Fermi coupling constant (1/GeV2) |
| FINESTRUCTURE | 7.297352533e-3 | fine-structure constant () |
| MAGNETIC | 12.566370614e-7 | magnetic constant (N/A2) |
| NEUTRONMASS | 1.67492716e-27 | neutron particle mass (kg) |
| NEUTRONMASSMEV | 939.565330 | neutron particle mass (MeV) |
| GRAVITATION | 6.673e-11 | Newtonian constant of gravitation (m3/kg/s2) |
| PLANCK | 6.62606876e-34 | Planck's constant (J s) |
| HBAR | 1.05457266e-34 | Planck's constant, reduced (J s) |
| PROTONMASS | 1.67262158e-27 | proton particle mass (kg) |
| PROTONMASSMEV | 938.271998 | proton particle mass (MeV) |
| RYDBERG | 10973731.568549 | Rydberg constant (1/m) |
| LIGHTSPEED | 299792458 | speed of light in a vacuum (m/s) |
| GRAVITYACC | 9.80665 | standard acceleration of gravity (m/s2) |
| ATMOSPHERE | 101325 | standard atmosphere (Pa) |
| STEFANBOLTZMANN | 5.670400e-8 | Stefan-Boltzmann constant (W/m2/K4) |
| THOMSON | 0.665245854e-28 | Thomson cross section (m2) |
| AMASS | 1.66053873e-27 | unified atomic mass unit (kg) |
| PI | 3.14159265358979323846 | pi |
| EARTHRADIUS | 6.378140e6 | radius of the earth at the equator (m) |
| AU | 1.4959787066e11 | astronomical unit (m) |
| EARTHMASS | 5.97370e24 | mass of the earth (kg) |
| E | 2.718281828459045235 | natural logarithm base |
| PARSEC | 3.0856775807e16 | parsec (m) |
| SUNMASS | 1.98892e30 | mass of the sun (kg) |
| SUNRADIUS | 6.96e8 | radius of the sun at the equator (m) |