NATL INST OF STAND & TECH A111D7 231A72 NBS TECHNICAL NOTE 361(Revised) *+ •«, - *EAU O* Metric Supplement May 1974 U.S. DEPARTMENT OF COMMERCE /National Bureau of Standards Liquid Densities of Oxygen, Nitrogen, Argon and Parahydrogen NATIONAL BUREAU OF STANDARDS The National Bureau of Standards ' was established by an act of Congress March 3, 1901. The Bureau's overall goal is to strengthen and advance the Nation's science and technology and facilitate their effective application for public benefit. To this end, the Bureau conducts research and provides: (1) a basis for the Nation's physical measurement system, (2) scientific and technological services for industry and government, (3) a technical basis for equity in trade, and (4) technical services to promote public safety. The Bureau consists of the Institute for Basic Standards, the Institute for Materials Research, the Institute for Applied Technology, the Institute for Computer Sciences and Technology, and the Office for Information Programs. THE INSTITUTE FOR BASIC STANDARDS provides the central basis within the United States of a complete and consistent system of physical measurement; coordinates that system with measurement systems of other nations; and furnishes essential services leading to accurate and uniform physical measurements throughout the Nation's scientific community, industry, and commerce. The Institute consists of a Center for Radiation Research, an Office of Meas- urement Services and the following divisions: Applied Mathematics — Electricity — Mechanics — Heat — Optical Physics — Nuclear 3 Sciences - — Applied Radiation " — Quantum Electronics * — Electromagnetics — Time and Frequency " — Laboratory Astrophysics " — Cryogenics *. THE INSTITUTE FOR MATERIALS RESEARCH conducts materials research leading to improved methods of measurement, standards, and data on the properties of well-characterized materials needed by industry, commerce, educational institutions, and Government; provides advisory and research services to other Government agencies; and develops, produces, and distributes standard reference materials. The Institute consists of the Office of Standard Reference Materials and the following divisions: Analytical Chemistry — Polymers — Metallurgy — Inorganic Materials — Reactor Radiation — Physical Chemistry. THE INSTITUTE FOR APPLIED TECHNOLOGY provides technical services to promote the use of available technology and to facilitate technological innovation in industry and Government; cooperates with public and private organizations leading to the development of technological standards (including mandatory safety standards), codes and methods of test; and provides technical advice and services to Government agencies upon request. The Institute consists of a Center for Building Technology and the following divisions and offices: Engineering and Product Standards — Weights and Measures — Invention and Innova- tion — Product Evaluation Technology — Electronic Technology — Technical Analysis — Measurement Engineering — Structures, Materials, and Life Safety 4 — Building Environment * — Technical Evaluation and Application * — Fire Technology. THE INSTITUTE FOR COMPUTER SCIENCES AND TECHNOLOGY conducts research and provides technical services designed to aid Government agencies in improving cost effec- tiveness in the conduct of their programs through the selection, acquisition, and effective utilization of automatic data processing equipment; and serves as the principal focus within the executive branch for the development of Federal standards for automatic data processing equipment, techniques, and computer languages. The Institute consists of the following divisions: Computer Services — Systems and Software — Computer Systems Engineering — Informa- tion Technology. THE OFFICE FOR INFORMATION PROGRAMS promotes optimum dissemination and accessibility of scientific information generated within NBS and other agencies of the Federal Government; promotes the development of the National Standard Reference Data System and a system of information analysis centers dealing with the broader aspects of the National Measurement System; provides appropriate services to ensure that the NBS staff has optimum accessibility to the scientific information of the world. The Office consists of the following organizational units: Office of Standard Reference Data — Office of Information Activities — Office of Technical Publications — Library — Office of International Relations. 1 Headquarters and Laboratories at Gaithersburg, Maryland, unless otherwise noted; mailing address Washington, D.C. 20234. 3 Part of the Center for Radiation Research. 3 Located at Boulder, Colorado 80302. * Part of the Center for Building Technology. J National Bureau of Standards NOV 11974 Qt\00 Liquid Densities of Oxygen, Nitrogen, Argon and Parahydrogen (Metric Supplement) H. M. Roder Cryogenics Division Institute for Basic Standards U»5* National Bureau of Standards Boulder, Colorado 80302 Ted>uu (lqJ vi£ri&, no> Shi /re /i s&d ** •"<*« o* U.S. DEPARTMENT OF COMMERCE, Frederick B. Dent, Secretary NATIONAL BUREAU OF STANDARDS. Richard W Roberts. Director Issued June 1974 National Bureau of Standards Technical Note 361 (Revised) (Metric Supplement) Nat. Bur. Stand. (U.S.),Tech. Note 361 (Revised), (Metrie Supplement). 114-pages (June 1974) CODEIN: NBTNAE Revises and up dates NBS Technical Note 361, issued January 31. 1968 For sale by the Superintendent of Documents, U.S. Government Printing Office. Washington, D.C. 20402 (Order by SD Catalog No. 03.46:361 (Revised) (Metric Supplement). 81.25 CONTENTS 1. INTRODUCTION 1 2. DESCRIPTION OF THE TABLES 2 3. DISCUSSION 5 4. LIMITATIONS 7 5. (OMITTED) 8 6. OXYGEN 9 7. NITROGEN 43 8. ARGON 67 9. PARAHYDROGEN 95 10. REFERENCES 108 APPENDIX 109 List of Figures Figure 1. Generalized Phase Diagram; Pressure vs. Volume 3 Figure 2. Generalized Phase Diagram; Pressure vs. Temperature 4 CONTENTS List of Tables Table 1. Density of Oxygen Near Atmospheric Pressure and Room Temperature . 9 Table 2. Uncertainties in the Data for Oxygen 10 Table 3. Saturated Liquid Oxygen 11 Table 4. Density of Compressed Liquid Oxygen 23 Table 5. Density of Nitrogen Near Atmospheric Pressure and Room Temperature . 43 Table 6. Uncertainties in the Data for Nitrogen 44 Table 7. Saturated Liquid Nitrogen 45 Table 8. Density of Compressed Liquid Nitrogen 53 Table 9. Density of Argon Near Atmospheric Pressure and Room Temperature ... 67 Table 10. Uncertainties in the Data for Argon 68 Table 11. Saturated Liquid Argon 6 9 Table 12. Density of Compressed Liquid Argon 79 Table 13. Density of Parahydrogen Near Atmospheric Pressure and Room Temperature 95 Table 14. Uncertainties in the Data for Parahydrogen 96 Table 15. Saturated Liquid Parahydrogen 97 Table 16. Density of Compressed Liquid Hydrogen 101 LIQUID DENSITIES OF OXYGEN, NITROGEN, ARGON, AND PARAHYDROGEN [Metric Supplement] H. M. Roder Tables of pressure, volume, density and temperature for the saturated liquid and for compressed liquid states from the triple point to the critical point, of oxygen, nitrogen, argon, and parahydrogen are presented. The table entries of temperature are in Kelvin and degrees Celsius, table entries in 2 pressure are in bars and kp/cm . Volumes or densities are given in several :>_' different units, and density ratios are tabulated for each entry. Estirrv. „_ the uncertainty for the tabulated data are given. The tables were prepared in the style and in the units preferred by the users. They are intended as source for both technician and engineer. Key Words: Argon; compressed liquid; density; density ratios; liquid; nitrogen; oxygen; parahydrogen; pressure; saturated liquid; tables; temperature; uncertainties; volume. 1. INTRODUCTION In this supplement standard density data for the saturated liquid and for compressed liquid states of four commercially important gases are presented in units commonly used by the European cryogenic industry. The supplement was prepared at the express request of the Industrial Gases Committee (IGC) of the Commission Permanente Internationale de l'Acetylene, de la Soudure Autogene et des Industries qui s'y Pattachent (CPI). The values presented are derived from the identical sources and computer programs which have been used earlier to prepare standard density data for users in the United States. The basic document is National Bureau of Standards (U.S.) Technical Note 361 (Revised), (Poder, et al. 1972), which was prepared to support a Code for Cryogenic Liquid- Measur ing Devices. This code was presented at the 57th National Conference on Weights and Measures (U.S. ), and has since been adopted by the conference. The basic document is a logical extension of earlier efforts. The first effort was pamphlet P-6, "Standard Density Data Atmospheric Gases and Hydrogen," by the Compressed Gas Association (CGA, 1965). In this pamphlet, values of pressure, tempera- ture, and density for the Normal Boiling Point (NBP) ' and Standard Temperature and Pressure (STP) were presented. NBP: 1 atm (760 torr) STP: 1 atm, 0°C The second effort was NBS Technical Note 361, "Saturated Liquid Densities of Oxygen, Nitrogen, Argon, and Parahydrogen" (Roder, et al. 1968). In addition to the two state points NBP and STP, this document included the definition of the saturated liquid curve. The sources selected were the best available at that time. In particular the compilations of oxygen, argon, and parahydrogen selected, each representing at least two man years of effort, were not available to