# nat_cst constants¶

This subpackage contains a few utility functions (see API), as well as the following natural constants, in cgs units:

Name |
Meaning |
---|---|

c = 2.99792458e10 |
Speed of light |

G = 6.67384e-8 |
Gravitational constant |

kB = 1.3806488e-16 |
Boltzman constant |

sigma = 5.670373e-5 |
Stefan-Boltzman constant |

bar = 1e6 |
1 bar in cgs |

atm = 1.01325e6 |
1 atmosphere in cgs |

losch = 2.68676e19 |
Loschmidt constant |

h = 6.62606957e-27 |
Planck constant |

r_sun = 6.955e10 |
Solar radius |

r_jup=7.1492e9 |
Jupiter equatorial radius |

r_jup_mean=6.9911e9 |
Jupiter mean radius |

m_jup = 1.89813e30 |
Jupiter mass |

m_sun = 1.9891e33 |
Solar mass |

AU = 1.49597871e13 |
Astronomical unit |

pc = 3.08567758e18 |
Parsec |

amu = 1.66053892e-24 |
Atomic mass unit |

nA = 6.0221413e23 |
Avogadro constant |

m_earth = 5.9722e27 |
Earth mass |

r_earth = 637813660. |
Earth radius |