:py:mod:`exo_k.util.molar_mass`
===============================

.. py:module:: exo_k.util.molar_mass

.. autoapi-nested-parse::

   @author: jeremy leconte



Module Contents
---------------

.. py:class:: Molar_mass


   Bases: :py:obj:`exo_k.util.singleton.Singleton`

   A class to compute the molar mass (in kg/mol) of regular molecules
   with a name written in a regular way (e.g. CO2, H2O, etc.).
   This class can also store the molar mass of custom gases with arbitrary names
   (for example: My_gas, earth_background).

   .. py:method:: init(*args, **kwds)

      Initializes empty dictionary of custom molecular masses.



   .. py:method:: add_species(species_dict)

      Add one or several species weights to the database.

      :param species_dict: Keys are gases names (they do not have to be real molecules).
                           Values are molar masses in kg/mol.
      :type species_dict: :class:`dict`


   .. py:method:: fetch(molecule_name)

      Computes the molar mass of a molecule in kg/mol

      :param molecule_name: str
                            Name of the molecule.

      :returns:     Molar mass in kg/mol.
      :rtype: float



.. py:data:: _atomic_mass_in_amu

   

.. py:data:: _molar_mass_atoms