earthkit.meteo.thermo.array.specific_humidity_from_vapour_pressure
==================================================================

.. py:function:: earthkit.meteo.thermo.array.specific_humidity_from_vapour_pressure(e, p, eps=0.0001)

   Compute the specific humidity from vapour pressure.

   :param e: Vapour pressure (Pa)
   :type e: :class:`number` or :class:`array-like`
   :param p: Pressure (Pa)
   :type p: :class:`number` or :class:`array-like`
   :param eps: Where p - e < ``eps`` nan is returned.
   :type eps: :class:`number`

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

   The computation is based on the following formula:

   .. math::

      q = \frac{\epsilon e}{p + e(\epsilon-1)}

   with :math:`\epsilon = R_{d}/R_{v}` (see :data:`earthkit.meteo.constants.epsilon`).