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National Advisory Committee for Aeronautics, Technical Notes - Helium Tables

These tables were prepared at the request of the U-S. Naval
Air Station, Lakehurst, New Jersey, and the naval representative
at the U. S. Helium Production Plant at Fort Worth, Texas.

These tables are intended to provide a standard method and
to facilitate the calculation of the quantity of "Standard Helium“
in high pressure containers (See example at end of Table IV).

The research data and the formulas used in the preparation of the
tables were furnished by the Research Laboratory of Physical
Chemistry, of the Massachusetts Institute of Technology.

It is to be noted that the nitrogen impurity referred to in
the tables (Part I) is not atmOSpheric nitrogen, which usually
means a mixture of nitrogen, argon, and the other inert gases_ of
the atmosphere, but pure nitrogen, containing no argon or other
inert gases, as is produced in the separation of helium from the
natural gas. This nitrogen impurity is more compressible than
the helium for pressureshigher than atmospheric and expands more
than helium for partial pressures below atmospheric.
If it is desired to find the free volume (1 atmosphere pres~
sure and 700 F.) of a mixture of helium and nitrogen, the follow-
ing formula gives a very cloSe approximation.

Standard Helium in mixture calculated for Tables III and IV =
Value in Table IV for (0) gauge and purity
Number of cubic feet of mixture at 70° F., 0 (gauge).
The author is responsible for the numerical calculations and
he will appreciate information as to any errors which may be
found so that they may be corrected.