earthkit.meteo.thermo.array.specific_humidity_from_relative_humidity
====================================================================

.. py:function:: earthkit.meteo.thermo.array.specific_humidity_from_relative_humidity(t, r, p)

   Compute the specific humidity from relative_humidity.

   :param t: Temperature (K)
   :type t: :class:`array-like`
   :param r: Relative humidity(%)
   :type r: :class:`array-like`
   :param p: Pressure (Pa)
   :type p: :class:`array-like`

   :returns: Specific humidity (kg/kg) units
   :rtype: :class:`array-like`

   The computation starts with determining the the vapour pressure:

   .. math::

       e(q, p) = r\; \frac{e_{msat}(t)}{100}

   where:

       * :math:`e` is the vapour pressure (see :func:`vapour_pressure`)
       * :math:`e_{msat}` is the :func:`saturation_vapour_pressure` based on the "mixed" phase
       * :math:`q` is the specific humidity

   Then :math:`q` is computed from :math:`e` using :func:`specific_humidity_from_vapour_pressure`.