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Momentum Artifacts in the Gravimetric Measurement of Rapid Desorption

  • Robert P. Merrill
  • Charles R. Arnold
  • Andrew J. Robell
Conference paper

Abstract

When desorption rates are very rapid, a gravimetric balance responds to the momentum associated with the desorbing molecules as well as the weight loss. For a desorption time constant of 10−2/sec or greater, this momentum artifact can obscure the weight loss measurements. The equations for the response of the balance are solved and compared with propane desorption from activated charcoal, a system which exhibits a marked momentum error. It is shown that the artifact can be eliminated experimentally by using a wire mesh support pan and an appropriate amount of sorbent placed in the bottom of a tare hangdown tube to null out molecular drag.

Keywords

Activate Charcoal Gate Valve Adsorption Pressure Apparent Weight Liquid Nitrogen Trap 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    R. E. Stickney and F. C. Hurlbut, Studies of normal momentum transfer by molecular beam techniques, in: J. A. Lauramann (ed.), Third International Symposium on Rarefied Gas Dynamics, Academic Press, New York (1963), p. 454.Google Scholar
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    R. D. Freeman, Momentum sensors, in: J. L. Margrave (ed.), The Characterization of High-Temperature Vapors, John Wiley and Sons, New York (1967), p. 152.Google Scholar
  3. 3.
    A. W. Czanderna, Ultramicrobalance review, in: S. P. Wolsky and E. J. Zdanuk (eds.). Ultra Micro Weight Determination in Controlled Environment, Inter science, New York (1969), Chapter 2, p. 42.Google Scholar

Copyright information

© Plenum Press, New York 1971

Authors and Affiliations

  • Robert P. Merrill
    • 1
  • Charles R. Arnold
    • 2
  • Andrew J. Robell
    • 2
  1. 1.Department of Chemical EngineeringUniversity of CaliforniaBerkeleyUSA
  2. 2.Lockheed Missiles and Space CompanyPalo AltoUSA

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