Pure water for relative density standard

Cox, R. A.; McCartney, M.; Culkin, F.

doi:10.1016/0011-7471(68)90008-9

Cited by 8 publications

(12 citation statements)

References 4 publications

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“…The beam of light reflected onto the sphere was also converged to a point by lens . However, since this beam had been cropped by screen CA, the intensity profile over its cross-section was no longer Gaussian; thus, it is not appropriate to apply (7) to this beam. An analytical treatment of diffraction similar to our case is given in the literature [21].…”

Section: Phase Changes During Propagationmentioning

confidence: 99%

“…This purified water was also used for cleaning various components of the measurement apparatus, because this system had the comparatively large capacity of 1,5 litres/min. To purify the sea water, we used an in-house threestage distillation system, which was a close copy of that described by Cox and coworkers [7]. This system continued distillation until the sea water evaporated, and recovered all the water contained in the sea water, so that the isotopic composition of the distillate was the same as that of the original sea water.…”

Section: Purification Systemsmentioning

confidence: 99%

“…Because of this, Cohen and others assigned an uncertainty of 4 parts in 10 6 [6] to the present value for the maximum density of water, while Cox and others assigned 5 parts in 10 6 [7]. The uncertainties are even larger at temperatures other than 4 C.…”

Section: Introductionmentioning

confidence: 96%

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Determination of the absolute density of water at 16 C and 0,101 325 MPa

Masui¹,

Fujii²,

Takenaka³

1995

Metrologia

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The absolute density of pure water was determined with an accuracy better than 1 part in . The method used was hydrostatic weighing in which a fused-quartz sphere, whose volume was measured by optical interferometry, was weighed in water. The density obtained in the hydrostatic weighing was corrected for impurity effects using differential densimetry and, using mass spectrometry, was further corrected for isotopic composition. A total of eighteen samples was measured using three spheres. The density of pure water at 16 C (ITS-90) and 0,101325 MPa having isotopic composition equal to that of Standard Mean Ocean Water was found to be 998,9468 kg m with a combined standard uncertainty of 0,0006 kg m . The maximum density at about 4 C, as calculated from our previous measurements of thermal expansion, was found to be 999,9756 kg m with an uncertainty of 0,0008 kg m . * Method of exact fractions.** Temperature = 16 C, pressure = 0,101 325 MPa, no water vapour.

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Section: Phase Changes During Propagationmentioning

confidence: 99%

Section: Purification Systemsmentioning

confidence: 99%

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Determination of the absolute density of water at 16 C and 0,101 325 MPa

Masui¹,

Fujii²,

Takenaka³

1995

Metrologia

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“…Our examinations were performed on water samples purified by the method of Cox et al [17]. The third distillation took place (as also the first two) in contact with the atmosphere and then our third distillate was collected.…”

Section: Methodsmentioning

confidence: 99%

“…Final LSM results for water sample density differences (ρ m,i − ρ m,j )/(g m −3 ) and float density differences Table 4. Some float density differences (ρ 3m − ρ 4m )/(g m −3 ) (column 5) and water density differences (ρ m,i − ρ m,j )/(g m −3 ) (last three columns) as measured with silica floats F 3 and F 4 at t = t m ; column 1 gives sample number in LSM processing, 2-source of water for purification by method of Cox et al [17]: tap water (TW), stored tap water (SW) and de-ionized tap water (DW), 3-date of measurement, 4-water conductivity after examination σ /(µS cm −1 ). (ρ m,i − ρ m,j )/(g m −3 ) are collected in table 4 (based on [15]).…”

Section: Measurementsmentioning

confidence: 99%