Physical properties of oxygen-17 water. Absolute viscosity and density of H₂ ¹⁷O between 15 and 35°C

The absolute viscosity of four oxygen-17 water samples is reported at 5°C intervals between 15 and 35°C. The absolute viscosity of 100% H ₂ ¹⁷O is determined by extrapolation of the measured viscosity of a highly enriched oxygen-17 sample, i.e., 86.53% ¹⁷O. The values calculated, based upon Eyring's theory of viscosity, for the other oxygen-17 samples are in excellent agreement with the experimental results. The isotope effect has been analyzed for H₂ ¹⁷O relative to natural water. The viscosity ratio at 25°C for H₂ ¹⁷O/H₂ ¹⁶O is 1.0226, whereas that for H ₂ ¹⁸O/H₂ ¹⁶O and D₂ ¹⁶O/H₂ ¹⁶O is 1.0536 and 1.2316, respectively.