# Physical Constants

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pi |
3.14.. | 3.14159 |

ee |
2.71.. | 2.71828 |

c |
light vel. | 2.99792e+08 m/s |

G |
grav. const | 6.67259e-11 N.m2/kg2 |

h |
Planck const | 6.62608e-34 J.s |

HI |
HI line | 1420.41 MHz |

R |
gas const | 8.31451 J/K/mol |

NA |
Avogadro # | 6.02214e+23 mol-1 |

e |
electron charge | 1.60218e-19 C |

mp |
proton mass | 1.67262e-27 kg |

mp_me |
mp/me | 1836.15 |

mu0 |
permeability vac. | 1.25664e-06 H/m |

eps0 |
permittivity vac. | 1.60218e-19 C |

k |
Boltzmann const | 1.38066e-23 J/K |

F |
Faraday const | 96485.3 C/mol |

me |
electron mass | 9.10939e-31 kg |

re |
electron radius | 2.8179e-15 m |

a0 |
Bohr’s radius | 5.2918e-11 m |

R0 |
solar radius | 6.9599e+08 m |

k2 |
IAU grav. const^2 | 0.000295912 AU3/d2/S0 |