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Journal of Research
of the
National Bureau of Standards


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The National Bureau of Standards' was established by an act of Congress on 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's technical work is per-
formed by the National Measurement Laboratory, the National Engineering Laboratory, and
the Institute for Computer Sciences and Technology.
THE NATIONAL MEASUREMENT LABORATORY provides the national system of
physical and chemical and materials measurement; coordinates the system with measurement
systems of other nations and furnishes essential services leading to accurate and uniform
physical and chemical measurement throughout the Nation's scientific community, industry,
and commerce; conducts materials research leading to improved methods of measurement,
standards, and data on the properties of materials needed by industry, commerce, educational
institutions, and Government; provides advisory and research services to other Government
agencies; develops, produces, and distributes Standard Reference Materials, and provides
calibration services. The Laboratory consists of the following centers:

Board of Editors
Churchill Eisenhart,

Executive Editor (Mathematics)
John W. Cooper (Physics)
Donald D. Wagman (Chemistry)
Andrew J. Fowell (Engineering)
Joseph O. Harrison (Computer Science)
Howard J. M. Hanley (Boulder Labs.)

Absolute Physical Quantities’ – Radiation Research – Thermodynamics and

Molecular Science – Analytical Chemistry – Materials Science.
THE NATIONAL ENGINEERING LABORATORY provides technology and technical ser-
vices to the public and private sectors to address national needs and to solve national
problems; conducts research in engineering and applied science in support of these efforts,
builds and maintains competence in the necessary disciplines required to carry out this
research and technical service, develops engineering data and measurement capabilit:es,
provides engineering measurement traceability services, develops test methods and proposes
engineering standards and code changes; develops and proposes new engineering practices.
and develops and improves mechanisms to transter results of its research to the ultimate user
The Laboratory consists of the following centers:


The Journal of Research of the National
Bureau of Standards reports NBS research
and development in those disciplines of the
physical and engineering sciences in which the
Bureau is active. These include physics, chem-
istry, engineering, mathematics, and com-
puter sciences. Papers cover a broad range of
subjects, with major emphasis on measure-
ment methodology, and the basic technology
underlying standardization. Also included
from time to time are survey articles on topics
closely related to the Bureau's technical and
scientific programs. As a special service to
subscribers each issue contains complete cita-
tions to all recent NBS publications in NBS
and non-NBS media. Issued six times a year.
Annual subscription: domestic $13; foreign
$16.25. Single copy, $3 domestic; $3.75

Applied Mathematics – Electronics and Electrical Engineering – Mechanical
Engineering and Process Technology – Building Technology – Fire Research

Consumer Product Technology – Field Methods,
research and provides scientific and technical services to aid Federal agencies in the selection,
acquisition, application, and use of computer technology to improve effectiveness and
economy in Government operations in accordance with Public Law 89-306 (40 ('SC 949)
relevant Executive Orders, and other directives; carries out this mission by managing the
Federal Information Processing Standards Program, developing Federal ADP standards
guidelines, and managing Federal participation in ADP voluntary standardization activities
provides scientific and technological advisory services and assistance to Federal agencies, ind
provides the technical foundation for computer-related policies of the Federal Government
The Institute consists of the following centers:

Programming Science and Technology – Computer Systems Engineering.

'Headquarters and Laboratories at Gaithersburg, MD, unless otherwise noted;
mailing address Washington, DC 20234.
Some divisions within the center are located at Boulder, CO 80303.

Note: The Journal was formerly published in
two sections: Section A “Physics and Chem-
istry” and Section B“Mathematical Sciences."


Philip M. Klutznick, Secretary

Ernest Ambler, Director

Order all publications from the Superintendent of Documents,
U.S. Government Printing Office, Washington, DC 20402
The Secretary of Commerce has determined that the publication of this
periodical is necessary in the transaction of the public business required
by law of this Department. Use of funds for printing this periodical has
been approved by the Director of the Office of Management and Budget
through June 30, 1981.

JOURNAL OF RESEARCH of the National Bureau of Standards

Vol. 85, No. 6, November December 1980



Observations on the Mechanisms of High Resistance Junction Formation in Aluminum
Wire Connections ..


On the Calculation of Critical Liquid-Vapor Lines of Binary Mixtures. P. Wielopolski.


Systematic Errors in an Isoperibol Solution Calorimeter Measured with Standard Reference

Reactions. Marthada V. Kilday ...


The Enthalpy of Solution of SRM 1655 (KCI) in H2O. Marthada V. Kilday.


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