Heat of Fusion of Solid Parahydrogen

Dwyer, R. F.; Cook, Gerhard A.; Shields, Bruce M.; Stellrecht, Donald H.

doi:10.1063/1.1695842

Cited by 17 publications

(7 citation statements)

References 7 publications

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“…Additional references on parahydrogen are given in the monograph [6]. Useful with the Clapeyron equation are recent determinations of heats of fusion [7] and of densities of solid parahydrogen [8]. The words: coexisting; at coexistence; orthobaric; at saturation; and saturated vapor, liquid or solid, all refer to one or more of at least two phases in equilibrium.…”

Section: Introductionmentioning

confidence: 99%

Density-temperature formulae for coexisting liquid and vapor and for freezing liquid parahydrogen

Goodwin¹

1966

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

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A sin gle fo rmul a is giv e n for coexiste nce te mpe rature as a continuou s fun cti on of th e va por·liquid densiti es . With six coeffi cie nts a nd se ve n adju sted expone nts, it ma y conveniently re place th e se ve ral formul ae form e rl y used in se pa rate regio ns of th e data. Freezin g liquid de nsiti es are desc ribed by a simple power law in te mpe rature, re placing more complicated formulae. Computed results are tabulated and compared with the de rived data.Key Words : Coe xi ste nce de nsities, freezing liquid de nsities, hydrogen, melting·line liquid densi· ti es, orthobaric de nsiti es, parahydrogen, vapor·liquid equilibrium.

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Section: Introductionmentioning

confidence: 99%

Density-temperature formulae for coexisting liquid and vapor and for freezing liquid parahydrogen

Goodwin¹

1966

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

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“…The Heats of Fusion at Elevated Pressures These values were determined experimentally by Dwyer, et al (1965b).…”

Section: 3mentioning

confidence: 99%

The thermodynamic properties of slush hydrogen and oxygen

Roder¹

1977

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The thermodynamic properties of hydrogen and oxygen have been calculated for temperatures both below and above the triple point. Values of the various physical properties required for the computations are either taken from the literature, or are extrapolated. If extrapolated, the extrapolations are based on the known behavior of other simple fluids. The results are presented in the form of computer programs which cover two regions of the phase diagram, solid-vapor, and solid-liquid. Input to the programs is temperature and quality. The properties returned include pressure, density, enthalpy, entropy and internal energy. The present programs for slush hydrogen and slush oxygen are an extension of and depend upon the equations of state developed previously for these gases.

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“…The hydrogen was pressurized in a separate "pump vessel" submerged in the same bath as the brass can containing the cell. The pump vessel and its operation have been described previously (1).…”

Section: Apparatusmentioning

confidence: 99%

“…Direct current electrical power was supplied to the copper top of the cell from two 12-volt storage batteries. The power was accurately measured with the help of calibrated resistors in a previously used (1) power-measuring circuit. The wires for the heater and for the thermometer were led through the top of the can and outside of the cryostat through stainless steel tubes.…”

Section: Apparatusmentioning

confidence: 99%