Vapor pressure of water at its triple point

Guildner, L. A.; Johnson, Daniel P.; Jones, Frank E.

doi:10.6028/jres.080a.054

Cited by 65 publications

(42 citation statements)

References 12 publications

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“…Comparable m easurem ents below 25°C were not available for comparison. R ecently, Guildner, Johnson, and Jones [5] completed a series of highly accurate m easurem ents of the vapor pressure of water at its triple point. They obtained the definitive value of 611.657 Pa 2 with an es timated total uncertainty at 99 percent confidence limits (3 sigmas plus the estimated sys tematic errors) of ± 0.010 Pa (± 16 ppm).…”

Section: Derivationmentioning

confidence: 99%

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Vapor pressure formulation for water in range 0 to 100 C. A revision

Wexler¹

1976

J. RES. NATL. BUR. STAN. SECT. A.

293

153

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In 1971 Wexl er and Greenspan p ublished a formulation for the vapor pressure of water encompassing the temperatu re ran ge 0 t o 100°C. In this paper a revision is m ad e of tha t earli er formulati on t o m a ke it consist ent with the defin itive experimental va lue of the vapor pre sure of ,mter at it s trip le po int recently obtained b y Gu ildn er, J ohnson, and J ones . The two formula t ions a re essenti a ll y identical at t emperatures from 25 to 100°C. F or t emperatures below 25°C the new formul at ion predicts values that a re higher than the 1971 formul ati on. At the triple point, the vapor press ure given by the new formula ti on is 611.657 P a '\'hereas the value given by the 1971 formul a ti on is 611.196 P a . A t a ble is given of th e va por pressure as a functi on of t emperature at O.l-deg intervals over the range 0 to 100°C on th e I n t ernational Prac tica l T emperature Scale of 1968, t ogethe r with values of the temperature d erivati ve a t 1-deg interv als.K eywords : Clap eyron equati on; saturati on vapor pressu re over water ; st eam; vapor pressure ; vapor pressure of wa t er ; virial coe ffic ients.

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Section: Derivationmentioning

confidence: 99%

“…The quantity 'Y is represented by the polynomial equation 'Y=ao+aIT+a2T2+asTs (5) where ao, aI, a2 and as are constants. Inserting eq (5) into the first integral on the right-hand side of eq (4) yields…”

Section: Derivationmentioning

confidence: 99%

Vapor pressure formulation for water in range 0 to 100 C. A revision

Wexler¹

1976

J. RES. NATL. BUR. STAN. SECT. A.

293

153

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“…The vapour pressure of both ice and liquid water at the triple point is p t = 611.657 ± 0.01 Pa at temperature T t = 273.16 K (Guildner et al 1976). The high accuracy of this measured value will be used as a boundary condition.…”

Section: Thermodynamic Basis Of the Vapour Pressure Of Ice (A) Clapeymentioning

confidence: 99%

Review of the vapour pressures of ice and supercooled water for atmospheric applications

Murphy

Koop

2005

Q. J. R. Meteorol. Soc.

1,294

1,280

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SUMMARYThe vapour pressures of ice and supercooled water are reviewed with an emphasis on atmospheric applications. Parametrizations are given for the vapour pressure, molar heat capacity, and latent heat of vaporization of both ice and liquid water. For ice, the experimental vapour pressure data are in agreement with a derivation from the Clapeyron equation. Below 200 K cubic ice may affect the vapour pressure of ice both in the atmosphere and in the laboratory. All of the commonly used parametrizations for the vapour pressure of supercooled water are extrapolations that were not originally intended for use below the freezing point. In addition, the World Meteorological Organization definition of the vapour pressure of supercooled water contains an easily overlooked typographical error. Recent data on the molar heat capacity of supercooled water are used to derive its vapour pressure. Nevertheless, the uncertainty is such that measurements of the deliquescence and freezing behaviour of aerosol particles are beginning to be limited by uncertainties in the thermodynamics of supercooled water.

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“…The experimental triple-point pressure, i.e., the vapor pressure of pure water at 273.16 K, was determined by Guildner et al (1976) as p t =611.657(10) Pa. The digits in parentheses are the combined standard uncertainty of the last two digits of the quoted value, as described by the "International System of Units (SI)" (BIPM, 2006;p.…”

Section: Reference Statesmentioning

confidence: 99%

Mutually consistent thermodynamic potentials for fluid water, ice and seawater: a new standard for oceanography

Feistel

Wright

Miyagawa³

et al. 2008

Ocean Sci.

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Abstract.A new seawater standard for oceanographic and engineering applications has been developed that consists of three independent thermodynamic potential functions, derived from extensive distinct sets of very accurate experimental data. The results have been formulated as Releases of the International Association for the Properties of Water and Steam, IAPWS (1996, 2006 and are expected to be adopted internationally by other organizations in subsequent years. In order to successfully perform computations such as phase equilibria from combinations of these potential functions, mutual compatibility and consistency of these independent mathematical functions must be ensured. In this article, a brief review of their separate development and ranges of validity is given. We analyse background details on the conditions specified at their reference states, the triple point and the standard ocean state, to ensure the mutual consistency of the different formulations, and the necessity and possibility of numerically evaluating metastable states of liquid water. Computed from this formulation in quadruple precision (128-bit floating point numbers), tables of numerical reference values are provided as anchor points for the consistent incorporation of additional potential functions in the future, and as unambiguous benchmarks to be used in the determination of numerical uncertainty estimates of doubleprecision implementations on different platforms that may be customized for special purposes.

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Vapor pressure of water at its triple point

Cited by 65 publications

References 12 publications

Vapor pressure formulation for water in range 0 to 100 C. A revision

Vapor pressure formulation for water in range 0 to 100 C. A revision

Review of the vapour pressures of ice and supercooled water for atmospheric applications

Mutually consistent thermodynamic potentials for fluid water, ice and seawater: a new standard for oceanography

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