1036):" There is a small error in your result. The hot platinum in your apparatus brings the water vapor to the same isotopic composition as atmospheric oxygen. Water vapor, however, is slightly richer in 016 than the liquid water with which it is in equilibrium.'rhus the liquid water in your apparatus, after equilibrium is attained. will be somewhat richer in 0 1 8 than atmospheric oxygen. From the results of Wabl and Urey, J. Chtm. Phys. 3, 411 (1935) ...
