code: def JT(self):
          r'''Joule Thomson coefficient of the chemical at its
          current phase and temperature, in units of [K/Pa].
  
          .. math::
              \mu_{JT} = \left(\frac{\partial T}{\partial P}\right)_H = \frac{1}{C_p}
              \left[T \left(\frac{\partial V}{\partial T}\right)_P - V\right]
              = \frac{V}{C_p}\left(\beta T-1\right)
  
          Examples
          --------
          >>> Chemical('water').JT
          -2.2150394958666407e-07
          '''
          return phase_select_property(phase=self.phase, l=self.JTl, g=self.JTgf JT(self):
          r'''Joule Thomson coefficient of the chemical at its
          current phase and temperature, in units of [K/Pa].
  
          .. math::
              \mu_{JT} = \left(\frac{\partial T}{\partial P}\right)_H = \frac{1}{C_p}
              \left[T \left(\frac{\partial V}{\partial T}\right)_P - V\right]
              = \frac{V}{C_p}\left(\beta T-1\right)
  
          Examples
          --------
          >>> Chemical('water').JT
          -2.2150394958666407e-07
          '''
          return phase_select_property(phase=self.phase, l=self.JTl, g=self.JTg)
docs: r'''Joule Thomson coefficient of the chemical at its
          current phase and temperature, in units of [K/Pa].
  
          .. math::
              \mu_{JT} = \left(\frac{\partial T}{\partial P}\right)_H = \frac{1}{C_p}
              \left[T \left(\frac{\partial V}{\partial T}\right)_P - V\right]
              = \frac{V}{C_p}\left(\beta T-1\right)
  
          Examples
          --------
          >>> Chemical('water').JT
          -2.2150394958666407e-07