code: def nug(self):
          r'''Kinematic viscosity of the gas phase of the chemical at its
          current temperature and pressure, in units of [m^2/s].
  
          .. math::
              \nu = \frac{\mu}{\rho}
  
          Utilizes the temperature and pressure dependent object oriented
          interfaces :obj:`thermo.volume.VolumeGas`,
          :obj:`thermo.viscosity.ViscosityGas`  to calculate the
          actual properties.
  
          Examples
          --------
          >>> Chemical('methane', T=115).nug
          2.5056924327995865e-06
          '''
          mug, rhog = self.mug, self.rhog
          if all([mug, rhog]):
              return nu_mu_converter(mu=mug, rho=rhog)
          return Nonf nug(self):
          r'''Kinematic viscosity of the gas phase of the chemical at its
          current temperature and pressure, in units of [m^2/s].
  
          .. math::
              \nu = \frac{\mu}{\rho}
  
          Utilizes the temperature and pressure dependent object oriented
          interfaces :obj:`thermo.volume.VolumeGas`,
          :obj:`thermo.viscosity.ViscosityGas`  to calculate the
          actual properties.
  
          Examples
          --------
          >>> Chemical('methane', T=115).nug
          2.5056924327995865e-06
          '''
          mug, rhog = self.mug, self.rhog
          if all([mug, rhog]):
              return nu_mu_converter(mu=mug, rho=rhog)
          return None
docs: r'''Kinematic viscosity of the gas phase of the chemical at its
          current temperature and pressure, in units of [m^2/s].
  
          .. math::
              \nu = \frac{\mu}{\rho}
  
          Utilizes the temperature and pressure dependent object oriented
          interfaces :obj:`thermo.volume.VolumeGas`,
          :obj:`thermo.viscosity.ViscosityGas`  to calculate the
          actual properties.
  
          Examples
          --------
          >>> Chemical('methane', T=115).nug
          2.5056924327995865e-06