Premium
Units of gas permeability constants
Author(s) -
Yasuda H.
Publication year - 1975
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1975.070190915
Subject(s) - permeability (electromagnetism) , polymer , gaseous diffusion , materials science , composite number , thermodynamics , membrane , chemistry , composite material , physics , biochemistry , electrode
Gas permeability constants of polymers are generally expressed by composite units which contain\documentclass{article}\pagestyle{empty}\begin{document}$$ \frac{{\left( {{\rm amount\ of\ gas}} \right)\left( {{\rm thickness\ of\ membrane}} \right)}}{{\left( {{\rm membrane\ area}} \right)\left( {{\rm time}} \right)\left( {{\rm differential\ pressure\ of\ gas}} \right)}}. $$\end{document} Numerous combinations of various units to express each component units are used. However, permeability constants of nongaseous substances in polymer membranes are generally expressed by the units of cm 2 /sec, which are identical to the units of the diffusion constant. The relationship between constants in units of cm 2 /sec and conventional composite units for gas permeability constants is presented, and the advantage of using the units in cm 2 /sec to express gas permeability constants is discussed.