docs: def ASHRAE_k(ID):
      r'''Returns thermal conductivity of a building or insulating material
      from a table in [1]_. Thermal conductivity is independent of temperature
      here. Many entries in the table are listed for varying densities, but the
      appropriate ID from the table must be selected to account for that.
  
      Parameters
      ----------
      ID : str
          ID corresponding to a material in the dictionary `ASHRAE`
  
      Returns
      -------
      k : float
          Thermal conductivity of the material, [W/m/K]
  
      Examples
      --------
      >>> ASHRAE_k(ID='Mineral fiber')
      0.036
  
      References
      ----------
      .. [1] ASHRAE Handbook: Fundamentals. American Society of Heating,
         Refrigerating and Air-Conditioning Engineers, Incorporated, 2013.
      '''
      values = ASHRAE[ID]
      if values[2]:
          return values[2]
      else:
          R = values[3]
          t = values[4]/1000. # mm to m
          return R_to_k(R, t)