Effect of Dissolved Air on the Density and Refractive Index of Water |
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| Authors: | A H Harvey S G Kaplan J H Burnett |
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| Affiliation: | (1) Physical and Chemical Properties Division, National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado, 80305-3328, U.S.A;(2) Optical Technology Division, National Institute of Standards and Technology, 100 Bureau Drive, Stop 8442, Gaithersburg, Maryland, 20899-8442, U.S.A;(3) Atomic Physics Division, National Institute of Standards and Technology, 100 Bureau Drive, Stop 8424, Gaithersburg, Maryland, 20899-8424, U.S.A |
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| Abstract: | The effect of dissolved air on the density and the refractive index of liquid water is studied from 0 to 50° C. The density
effect is calculated from the best available values of Henry’s constants and partial molar volumes for the components of air;
the results are in agreement with some previous experimental studies, but not others. The refractive-index effect is calculated
as a function of wavelength from the same information, plus the refractivities of the atmospheric gases. Experimental measurements
of the refractive-index effect are reported at both visible and ultraviolet wavelengths; the measured and calculated values
are in reasonable agreement. The magnitude of the refractive-index change, while small, is several times larger than a previous
estimate in the literature. |
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| Keywords: | air calibration density refractive index water |
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