earthkit.meteo.thermo.array.specific_gas_constant
=================================================

.. py:function:: earthkit.meteo.thermo.array.specific_gas_constant(q)

   Compute the specific gas constant of moist air.

   Specific content of cloud particles and hydrometeors are neglected.

   :param q: Specific humidity (kg/kg)
   :type q: :class:`number` or :class:`array-like`

   :returns: Specific gas constant of moist air (J kg-1 K-1)
   :rtype: :class:`number` or :class:`array-like`

   The computation is based on the following formula:

   .. math::

       R = R_{d} + (R_{v} - R_{d}) q

   where:

       * :math:`R_{d}` is the gas constant for dry air (see :data:`earthkit.meteo.constants.Rd`)
       * :math:`R_{v}` is the gas constant for water vapour (see :data:`earthkit.meteo.constants.Rv`)