Integrated tables of pressure, volume, and temperature for the saturated liquid, from the triple point to the critical point of the gases, have been developed. Tables include definition of saturated liquid curve. Values are presented in metric and practical units. Advantages of the new tables are discussed

Johnson, V. J.

Mc Carty, R. D.

Roder, H. M.

English

NASA Technical Reports Server

September 1970	 Brief 70-10333 
/YCo.
	
AEC-NASA TECH BRIEF 
44Tu 
AEC-NASA Tech Briefs announce new technology derived from the research and development program of the U.S. AEC or 
from AEC-NASA interagency efforts. They are issued to encourage commercial application. Tech Briefs are available on a 
subscription basis from the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
Requests for individual copies or questions relating to the Tech Brief program may be directed to the Technology Utilizatkn 
Division, NASA, Code UT, Washington, D.C. 20546. 
Uniform Data System Standardizes Technical Computations

and the Purchasing of Commercially Important Gases 
.
Commercial and Government users of oxygen, ni-
trogen, argon and parahydrogen have encountered 
difficulties in costing, billing, and ordering these com-
mercially important gases because different suppliers 
use slightly different values for the physical properties 
of the gases. Integrated tables of pressure, volume, and 
temperature for the saturated liquid, from the triple 
point to the critical point of the gases, have now been 
developed from sources which are considered to be the 
best available today. The tables should benefit both 
suppliers and purchasers, engineers and scientists. 
Earlier efforts to standardize values for the physical 
properties of these gases included values of pressure, 
temperature, density for the normal boiling point 
(NBP), and standard temperature and pressure. The 
new tables also include a definition of the saturated 
liquid curve. Numerical values differ from the earlier 
selections by as much as 0.1%. 
The tables include entries of integral values of tem-
perature (in both degrees Kelvin (K) and degrees 
Rankine (R)), and pressure in both atmospheres and 
psia. Volumes and densities in three different units 
and a density ratio are tabulated for each entry. Esti-
mates of the uncertainty of the tabulated data are 
given. Values are presented both in metric and practi-
cal units. The principal tables are merged into tables 
containing even values of pressure in both atmos-
pheres and psia and even values of temperature in 
both K and R. The values of density in these tables 
are also presented in terms of (specific) volume and in 
terms of a ratio referred to the density at the NBP. 
Supplemental tables give values of density or volume 
at one atmosphere near room temperature. A third 
set of tables gives the uncertainties in the. data. The
parts of the tables which lie in the practical range of 
pressures for liquid transfer are also illustrated in 
convenient graphical form. In addition, sample prob-
lems are worked out to demonstrate the ease in com-
puting billings. 
The advantages in using the new tables include the 
following: 
1. Each of the compilations selected presents a con-
sistent set of values from a single source for each 
fluid. 
2. All available data, in particular the correlation of 
the single phase pressure-volume-temperature data 
with the saturation boundaries and the vapor pres-
sure curve, have been considered, not only the value 
of the NBP. 
3. The equations of state, in the form of computer 
programs, allow determination of values, both at 
liquid temperatures and at room temperatures. 
4. The equations of state used present a consistent 
set of values for the saturation boundary as well 
as for the compressed fluid states. As flowmeter 
technology improves, an extension to the com-
pressed fluid state will become imperative. Such a 
change can be accomplished without a further ad-
justment in the numerical values. 
Note: 
Requests for further information may be directed to: 
Technology Utilization Officer 
AEC-NASA Space Nuclear Propulsion 
Office 
U.S. Atomic Energy Commission 
Washington, D. C. 20545 
Reference: B70-10333
(continued overleaf( 
This document was prepared under the sponsorship of the Atomic	 liability resulting from the use of the information contained in this 
Energy Commission and/or the National Aeronautics and Space document, or warrants that the use of any information, apparatus, 
Administration. Neither the United States Government nor any per-	 method, or process disclosed in this document may not infringe pri-
son acting on behalf of the United States Government assumes any vately owned rights.
https://ntrs.nasa.gov/search.jsp?R=19700000321 2020-03-17T00:20:00+00:00Z
Patent status: 
No patent action is contemplated by NASA. 
Source: H. M. Roder, R. D. McCarty and 
V. J. Johnson 
U.S. Department of Commerce 
National Bureau of Standards 
(NUC- 10549)
is 
. 
Category 04 Brief 70-10333


Uniform data system standardizes technical computations and the purchasing of commercially important gases

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