Vapor Pressure of Water at Its Triple Point: Highly Accurate Value

Details Vapor Pressure of Water at Its Triple Point: Highly Accurate Value Vapor Pressure of Water at Its Triple Point: Highly Accurate Value

Mar 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976sci...191.1261g&link_type=abstract

Science, Volume 191, Issue 4233, pp. 1261

Physics

Scientific paper

The vapor pressure of water at its triple point was measured with greatly increased accuracy. The triple point was realized with newly designed equipment that enhanced the stability of the pressure and permitted any air released from solution to be removed by pumping. A diaphragm pressure transducer separated the water vapor from the helium used to transmit the pressure to the manometer. The pressure was measured with the National Bureau of Standards precision mercury manometer. The vapor pressure at the triple point was found to be 611.657 pascals with random uncertainties at the 99 percent confidence level of ± 0.010 pascal. The systematic errors are estimated to be relatively insignificant.

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