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- Purification of sodium chloride and potassium chloride for use in electrochemical work, and the determination of small amounts of bromide
- Journal of Research of NIST and Predecessor Publications
- $Purification of substances by a process of freezing and fractional melting under equilibrium...$
- Purification of substances by a process of freezing and fractional melting under equilibrium conditions
- Journal of Research of NIST and Predecessor Publications
- $Purification of substances by slow fractional freezing$
- Purification of substances by slow fractional freezing
- Journal of Research of NIST and Predecessor Publications
- Purification of Zirconium
- NBS-NIST Technical Series Publications
- Purification, purity, and freezing points of 30 hydrocarbons of the API-Standard and API-NBS series
- Journal of Research of NIST and Predecessor Publications
- Purification, purity, and freezing points of 31 hydrocarbons of the API-NBS series
- Journal of Research of NIST and Predecessor Publications
- Purification, purity, and freezing points of 7 heptanes, 16 octanes, 6 pentenes, cyclopentene, and 7 C9H12 alkylbenzenes of the API-standard and API-NBS series
- Journal of Research of NIST and Predecessor Publications
- Purification, purity, and freezing points of 8 nonanes, 11 alkylcyclopentanes, 6 alkylcyclohexanes, and 4 butylbenzenes of the API-standard and API-NBS series
- Journal of Research of NIST and Predecessor Publications
- Purification, purity, and freezing points of n-decane, 4 alkylcyclopentanes, 9 alkylcyclohexanes, 2 monoolefins, 1, 2-butadiene, and 2-butyne of the API-Standard and API-NBS series
- Journal of Research of NIST and Predecessor Publications
- Purification, purity, and freezing points of twenty-nine hydrocarbons of the API-standard and API-NBS series
- Journal of Research of NIST and Predecessor Publications
- Purifier and final heat exchanger units of the 250-liter-per-hour parahydrogen liquifier at the NBS Boulder Laboratories
- Photographs; History; Metrology; Low temperatures; Low temperature research; Instruments
- This image is part of the Cryogenics collection. The National Bureau of Standards’ (NBS) interest in cryogenics (the production of very low temperatures and the properties of materials at those temperatures) dates back to 1904, when a plant for...
- Historic Images
- Purity analysis of highly purified materials by time-temperature cryometry
- Visual observation of the freezing and melting of compounds in cells used for the determination of purity has uncovered some heretofore unexpected behavior. This behavior has been correlated with certain difficulties experienced in the measurement...
- Journal of Research of NIST and Predecessor Publications
- Purity and intensity of monochromatic light sources
- Journal of Research of NIST and Predecessor Publications
- PVT and vapor pressure measurements on ethane
- Density; ethane; vapor pressure; PVT
- New measurements of the vapor pressures and PVT properties of ethane are reported. PVT determinations have been made from near the triple point to 320 K at pressures to 33 MPa. The density range investigated extends to more than three times the...
- Journal of Research of NIST and Predecessor Publications
- PVT measurements, virial coefficients, and Joule-Thomson inversion curve of fluorine
- Isochores; isotherms; Joule-Thomson inversion curve; liquid densities along melting line; PVT data; second virial coefficient; third virial coefficient
- Experimental PVT measurements on gaseous and liquid fluorine from the triple point (53.5 K) to 300 K at pressures to about 21 MN/m2 are presented. The data are represented by a truncated virial equation in the low-density region. Comparisons of the...
- Journal of Research of NIST and Predecessor Publications
- PVT relationships for liquid and glassy poly(vinyl acetate)
- Density; dilatometer; entropy; glass transition; glass; liquid; polymer; poly(vinyl acetate); PVT; relaxation
- PVT measurements were made on liquid and glassy poly(vinyl acetate) over ranges of -30 to 100 C and 0 to 800 bar (gage pressure). The data were obtained by three different thermodynamic histories: (a) variable formation pressure. (b) constant...
- Journal of Research of NIST and Predecessor Publications
- Pyranose-furanose interconversions with reference to the mutarotations of galactose, levulose, lactulose,and turanose
- Journal of Research of NIST and Predecessor Publications
- Pyrex, Quartz, and Metal Rods.
- Three rods. One made of Pyrex, one of Quartz, and one Metal (engraved 463 mm). Made by Brown and Sharp Manufacturing, Providence, RI.
- NIST Museum Artifacts
- Pyrochlore-type compounds containing double oxides of trivalent and tetravalent ions
- Journal of Research of NIST and Predecessor Publications
- Pyrolysis of anionic and thermally prepared polystyrenes
- Anionic polystyrene; molecular weight distributions; molecular weights; thermal polystyrene; polymers; polystyrene degradation; pyrolysis; thermolysis
- The changes in molecular weights, their distributions, and initial rates have been measured, for a series of polystyrenes prepared by thermal and anionic procedures. The information obtained and previous results can be explained to a very large...
- Journal of Research of NIST and Predecessor Publications

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