Thermal Conductivity of Gaseous Ammonia at Different Temperatures

Thermal conductivity of the polar gas ammonia at a pressure of 18 cm of Hg has been measured over the temperature range 38–200°C by the hot-wire method. With the help of a theory recently put forward by Mason and Monchick, the collision numbers for rotational relaxation Zrot have been determined from the experimental data. The values thus obtained show that Zrot increases with rise of temperature.