Download or read book Vapor pressure Measurements by Effusion Methods written by Arne Landsberg and published by . This book was released on 1977 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Vapor pressure Measurements by Effusion Methods written by Arne Landsberg and published by . This book was released on 1977 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Knudsen Effusion Apparatus for Vapor Pressure Measurements written by S. D. Hill and published by . This book was released on 1966 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measurement of Vapor Pressure by Effusion Method written by Emil Carl Miller and published by . This book was released on 1935 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Vapor Pressure Measurements by the Torsion effusion Method written by David Arthur Schulz and published by . This book was released on 1962 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Torsion effusion Apparatus for the Measurement of Vapor Pressure written by Peter Martin (Jr) and published by . This book was released on 1963 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Balson Torsion-Effusion method is based on the measurement of the recoil force developed by effusion gas. The apparatus consists of an effusion vessel suspended by a fiber in such a way that two escaping gas streams tend to twist the fiber in the same direction. The torque produced is then measured by observing the mirror image deflection on a scale. Using this measured angle of deflection, dimensions of the holes, their distances from the axis of the suspension and the torsional rigidity of the fiber, one can caluculate the vapor pressure. The advantages of the method are: (1) it gives an absolute measure of the vapor pressure, (2) only a small amount of substance is required, (3) knowledge of the molecular weight of the material is unnecessary in order to calculate the vapor pressure. A static vacuum system was designed and constructed to be used with the Torsion-Effusion apparatus. It consisted of a mechanical fore pump, 3-stage mercury diffusion pump, liquid nitrogen traps and a cold cathode ionization gage. The applications of the vapor pressure measurements are also discussed. (Author).

Download or read book A Torsion Effusion Apparatus for Vapor Pressure Measurement written by Larry A. Haas and published by . This book was released on 1965 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Development of a Method to Determine Vapor Pressure Data of Low Volatile Chemicals from a Knudsen Effusion Technique written by Andrew R. Harshman and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: Vapor pressure data are vital to understanding impacts that substances, specifically pesticides, may exert on the environment. They enter into atmospheric deposition models for such chemicals which determine the fate and transport of these species in the environment. At normal application temperatures (i.e. room temperature) the vapor pressures of many of these chemicals are too low to be determined by conventional means. An isothermal Knudsen effusion technique was designed and developed in our laboratory for such measurements. The effusion mass as a function of time is measured in our technique using a thickness shear mode (TSM) acoustic wave sensor, which allows for extremely high (few nanograms) sensitivity. This sensitivity allows for much more rapid determination of low vapor pressures (10-1 to 10-5 Pa) than is possible by other Knudsen effusion techniques. Basing the effusion mass measurement on the TSM sensor as in our apparatus eliminates the typically seen dependence on vibration in conventional microbalance-based effusion techniques. Full design details of our apparatus and specifically the Knudsen cell, based on original equations derived by Knudsen, and many corrections that have been noted in the literature for cell and effusion-hole dimensions, are presented. The accuracy of our methodwas tested by a comparison of published vapor pressure data to vapor pressure data acquired in our laboratory with measurements on naphthalene and catechol.

Download or read book Vapor Pressure Measurements of LiBH4 NaBH4 and CA BH4 2 Using Knudsen Torsion Effusion Gravimetric Method written by Mohammad Masoumi Danyan and published by . This book was released on 2016 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measurements of Vapor Pressure on Silver by Effusion and Isotope Exchange Methods written by Jan Vřešťál and published by . This book was released on 1969 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Vapor Pressure of Zirconium Tetrachloride by Molecular Effusion written by James M. Scarborough and published by . This book was released on 1950 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Briefly, the methods of determining low vapor pressures have been reviewed. Emphasis has been placed on molecular effusion, including a theoretical discussion and the subsequent application of molecular beams to the determination of vapor pressure. The problems met in the preparation, purification and handling of anhydrous zirconium tetrachloride have been discussed. Vapor pressure measurements on zirconium tetrachloride have been made over a temperature range of fifty degrees, 70 deg C. to 120 deg C, . and the mean molar heat of sublimation for this temperature range has been calculated. The value of 20.3 kcal per mole obtained is not unreasonable in view of the fact that values for the same quantity determined by other investigators in the temperature range of 239 deg C. to 346 deg C. is reported to be 24.4 kcal. per mole.

Download or read book Vapour Pressure Measurements by Means of the Torsion Effusion Technique written by G. McHugh and published by . This book was released on 1972 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Studies in Vapor Pressure written by Alan Wilfred Cranbrook Menzies and published by . This book was released on 1910 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Molecular Flow and the Effusion Process in the Measurement of Vapor Pressures written by Robert D. Freeman and published by . This book was released on 1963 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt: Progress on several approaches designed to clarify the understanding of the effusion under nonideal conditions is reported. Transmission probabilities, angular distribution functions, and recoil force corrections have been computed for cylindrical and conical orifices. The design and construction of an apparatus for the experimental study of angular distribution of molecules which effuse from non-ideal orifices is described. Preliminary results are presented for the multicell technique for experimental evaluation of transmission probabilities. The Electrodynamometer Momentum Detector has been tested; with it torques in the range 0.05 to 0.5 dyne-cm can be measured. A new technique, the MicrobalanceInverted Knudsen Effusion-Recoil (MIKER) Technique, for the measurement of vapor pressure and of molecular weights of vapors is discussed and the apparatus, especially the microbalance, which has been designed and constructed for its realization is described. Preliminary results for calcium fluoride are presented. (Author).

Download or read book Vapor Pressure of the Chemical Elements written by Andreĭ Nikolaevich Nesmei︠a︡nov and published by . This book was released on 1963 with total page 506 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A torsion effusion apparatus for vapor pressure measurement vapor pressure of silver from 1 200 to 1 500 K written by Larry A. Haas and published by . This book was released on 1965 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Molecular Flow and the Effusioin Process in the Measurement of Vapor Pressures written by Robert David Freeman and published by . This book was released on 1963 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt: Progress on several approaches designed to clarify the understanding of the effusion under nonideal conditions is reported. Transmission probabilities, angular distribution functions, and recoil force corrections have been computed for cylindrical and conical orifices. The design and construction of an apparatus for the experimental study of angular distribution of molecules which effuse from non-ideal orifices is described. Preliminary results are presented for the multicell technique for experimental evaluation of transmission probabilities. The Electrodynamometer Momentum Detector has been tested; with it torques in the range 0.05 to 0.5 dyne-cm can be measured. A new technique, the MicrobalanceInverted Knudsen Effusion-Recoil (MIKER) Technique, for the measurement of vapor pressure and of molecular weights of vapors is discussed and the apparatus, especially the microbalance, which has been designed and constructed for its realization is described. Preliminary results for calcium fluoride are presented.).