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Wednesday, May 20, 2020 | History

2 edition of Vapor-pressure measurements by effusion methods found in the catalog.

Vapor-pressure measurements by effusion methods

Arne Landsberg

Vapor-pressure measurements by effusion methods

by Arne Landsberg

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Published by Dept. of the Interior, Bureau of Mines in [Washington] .
Written in English

    Subjects:
  • Vapor pressure.

  • Edition Notes

    Bibliography: p. 26-27.

    Statementby Arne Landsberg, Arnold Admas, and Stephen D. Hill : [Albany Mettalurgy Research Center].
    SeriesReport of investigations - Bureau of Mines ; 8207, Report of investigations (United States. Bureau of Mines) -- 8207.
    ContributionsAdams, Arnold., Hill, S. D., United States. Bureau of Mines.
    The Physical Object
    Pagination[3], 27 p. :
    Number of Pages27
    ID Numbers
    Open LibraryOL15213837M

    VAPOR PRESSURE OF A SOLID BY KNUDSEN EFFUSION Introduction. Methods of measuring vapor pressure can be divided into direct methods and indirect methods. In a direct method, the actual pressure in the pure equilibrium vapor is determined, and the main experimental questions have to do with choice of manometer, sample purity, and how to be File Size: 22KB. Vapor Pressure Analyzer Knudsen effusion method The VPA measures the vapor pressures of solids, liquids, and oils using the Knudsen effusion method. The vapor pressure is an important physical property that defines the amount of vapor phase material that exists in equilibrium with the original material.

    Vapor pressure measurements can be used to find the mass of naphthalene transferred from the sample to a stream of gas passed over tt. Thereby, adsorption of a sample on a catalyst may be : Samuel Bernard Bliden. Experimental measurements of the vapor pressure of mercury have a long history, dating all the way back to the s. Table 1 gives a detailed compilation of sources of vapor-pressure data from to the present, along with the temperature range of the measurements, the experimental method used, and an estimate of the uncertainty of these Cited by:

    Abstract. Empirical correlations, between the enthalpy of sublimation and the temperature at which the vapour pressure is Pa, derived from results obtained through effusion techniques of several hundreds of compounds are : Manuel João S. Monte. Apparatus for Vapor Pressure Determination. Vapor pressure (also known as equilibrium vapor pressure or saturation vapor pressure), is the pressure of a vapor in equilibrium with its non-vapor phases in a closed container. At a given temperature, the pressure at which a .


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Vapor-pressure measurements by effusion methods by Arne Landsberg Download PDF EPUB FB2

Vapor-pressure measurements by effusion methods. [Washington]: Dept. of the Interior, Bureau of Mines, (OCoLC) Online version: Landsberg, Arne. Vapor-pressure measurements by effusion methods. [Washington]: Dept. of the Interior, Bureau of Mines, (OCoLC) Material Type: Government publication, National government.

Vapor-pressure measurements by effusion methods [Landsberg, Arne] on *FREE* shipping on qualifying offers. Vapor-pressure measurements by effusion methodsAuthor: Arne Landsberg. Vapor pressure, a temperature-dependent measure of volatility rates from water or from solid surfaces (moist or dry soil), is a major predictor of the environmental fate and transport.

Table provides the vapor pressure data for our representative compounds [8]. Volatile compounds such as gases and solvents characterized by high vapor.

where P is vapor pressure, R is universal gas constant (m -1), T is temperature in Kelvin, M is molecular weight, and A is area Vapor-pressure measurements by effusion methods book the aperture of the Knudsen cell.

The gradient of the linear portion of mass against time data is used to measure dm/dt (Figure 1). The ΔH is the heat of vaporization, and a and b are constants. Figure 1. A schematic form of Knudsen mass vs time dataAuthor: Surface Measurement Systems Ltd.

Vapor Pressure Measurements for Metal Chloride Systems by the Knudsen Effusion Method Article in MATERIALS TRANSACTIONS 46(6) June with Reads How we measure 'reads'.

Vapor pressure determination of agrochemicals is required for EPA and EC registration. The Knudsen effusion method is an approved regulatory method of performing vapor pressure measurements. The Knudsen effusion method is a dynamic technique based on the rate of escape of vapor molecules through an orifice into a vacuum.

We have modified the Knudsen effusion apparatus, replacing a. At each temperature of the effusion cell, the vapor pressure of the analyzed sample was derived from the torsion angle, a, of the Ni-Pt fiber [(6 X ) X cm] to which the cell was suspended, by the well-known equation P(atm) = 2Ka(alblfl + a2bzt2) 1 = K a where K is a constant that takes into account the geometrical constants of TABLE 2 Cited by: Development of a Method to Determine Vapor Pressure Data of Low Volatile Chemicals from a Knudsen Effusion Technique by Andrew R.

Harshman A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Chemical Engineering Department of Chemical Engineering College of Engineering University of South Florida. However, a major advantage to using mercury in a manometer is the low vapor pressure of mercury, which is torr at 25 °C.

This small vapor pressure can be ignored for all but very low pressure this is water, this can change the vapor pressure of the liquid by evaporation of itself. Vapor pressure (or vapour pressure in British English; see spelling differences) or equilibrium vapor pressure is defined as the pressure exerted by a vapor in thermodynamic equilibrium with its condensed phases (solid or liquid) at a given temperature in a closed equilibrium vapor pressure is an indication of a liquid's evaporation rate.

It relates to the tendency of particles to. Vapor pressure. The Knudsen effusion technique derives from Knudsen’s Kinetic Theory of Gases. The Knudsen effusion method is an indirect measurement technique based on the molecular effusion of a vapor through an orifice into a high vacuum chamber and is generally used to measure the vapor pressure of low volatility by: Vapor pressure measurements on metals are usually divided Into two main groups: l) high pressure methods used in the range from 10 to lO^mm of Hg, which have been used for the.

The effect of apparatus dimensions on the accuracy of vapor pressure measurements by Knudsen's effusion method is discussed for the usual type of experimental arrangement. It is shown that the total surface area of a condensed solid phase is not fundamentally related to the pressure of the effusing vapor.

Equations are derived which may be used to check the pressure of the effusing vapor Cited by: This test method describes procedures for determination of the vapor pressure of liquids by ebulliometry (boiling point measurements). It is applicable to pure liquids and azeotropes that have an atmospheric boiling point between and K and that can be condensed completely and returned to the ebulliometer boiler, that is, all materials must be condensable at total reflux.

Experimental and theoretical determination of the saturation vapor pressure of silicon in a wide range of temperatures December Russian Journal of Inorganic Chemistry 55(13) Development of a method to determine vapor pressure data of low volatile chemicals from a Knudsen effusion technique such measurements.

The effusion mass as a f unction of time is measured in our technique temperature control and time constraint advantages over other methods. The Knudsen Effusion method utilizes an isothermal cell (K. Vapor Pressure Analyzer. The Vapor Pressure Analyzer or VPA measures the vapor pressures of solids, liquids and oils using the Knudsen effusion method.

The vapor pressure is an important material physical property that defines the amount of vapor phase material that exists in. The gas saturation method is very useful for providing vapor pressure data at normal environmental temperatures (–40 to +60°C). At least three temperature values should be studied to allow definition of a vapor pressure-temperature correlation.

Values determined should be based on temperature selections such that a measurement is made at 25°C (as recommended by IUPAC) (1), 2 a value. Vapor Pressure of Agrochemicals by the Knudsen Effusion Method Using a Quartz Crystal Microbalance.

@article{osti_, title = {THE DETERMINATION OF THE SATURATION VAPOR PRESSURE OF NIOBIUM DIOXIDE}, author = {Shchukarev, S.A. and Semenov, G.A. and Frantseva, K.E.}, abstractNote = {>The vapor pressure of NbO/sub 2/ was measured in Knudsen effusion chamber made of forged molybdenum.

The diameter of the opening was mm, and the ratio of the evaporating area to the. between the vapor pressure inside the effusion cell and the measured ion intensity is the key to KEMS and is derived in detail.

Then common methods used to determine thermo-dynamic quantities with KEMS are discussed. Enthalpies of vaporization ∆ vap o H T —the fundamental measurement—are.The reliability of the thermodynamic data for the vaporization of UO/sub 2/ was improved by presenting precise mass spectrometric measurements of the enthalpy of sublimation ever a wide temperature range; calculation of thermodynamic functions for UO/sub 2/ from the critical assessment of available data, and analyzing the departure from molecular flow and the failure of the Knudsen effusion.The vapor pressure of these substances is important in connection with calculating heats of explosion* A gas effusion technique was used in the determinations* The writer wishes to express his appreciation for the assistance and encouragement given him by Associate Professor Richard A.

Reinhardt of the U. S, Naval Postgraduate School in the.