Observations on Behavior of H2 Gas.  S.H. Shakman

Flint's hypothesis of a weight of 4 for H2 gas on a scale of 
32 for O2 gas* is supported by
(1) similarities with He gas:
(a) He has about 98% the lifting power of H2** and
(b) an average of less than 4% separates observed diffusion
coefficients for He and H2 in the 8 instances affording direct
comparison listed in references***; (2) peculiarities in the behavior of H2 gas as noted by
(a) Arrhenius, who referred to hydrogen's cathode ray absorption-to-density ratio (5610) as a "notable exception" from the mean [2794=mean for 8 sol- ids (collodium, paper, glass, mica, aluminum, brass, silver, gold) and 3 gases at 760 mm. Hg. (H2, air, SO2) as derived by Lenard]; however, when H2 is assigned a weight of 4 (v.s. 2), its absorption-to-density ratio (2805) correlates closely with this mean****, and
(b) Graham, who commented that the "want of mechanical equivalency
in hydrogen mixtures is exceedingly remarkable, being a marked departure
from the usual uniformity of gaseous properties"*****; and (3) previously reported studies involving approximately 200 diffusion coefficients (see [O] The Weight of Hydrogen Gas.)****** *FLINT, L.H., Behavior Patterns of Hydration (1964), Ch. 11.
**CRC Handbook of Chemistry and Physics, 1985-6, B-20. ***CHAPMAN, S., etal, Mathematical Theory of Non-Uniform Gases (1970), 263, 267; and HIRSCHFELDER, J.O., etal., Molecular Theory of Gases and Liquids (1954), 579, 601. ****ARRHENIUS, S., Theories of Chemistry (1907), 91. *****GRAHAM, THOMAS, Elements of Chemistry (1850), 81. ******SHAKMAN, S.H., Abstracts AAAS, 1986, p. 119 (No. 212).



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