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Measuring Humidity in the Charters of Freedom Encasements Using a Moisture Condensation MethodThe relative humidity of the atmosphere in the encasements containing the U.S. Constitution Pages 1 and 4, the Declaration of Independence, and the Bill of Rights was measured to be in the range of 55% to 61%. This value is significantly higher than the presumed relative humidity between 25 to 35 %, but is consistent with the measured samples extracted from Pages 2 and 3 of the U.S. Constitution. The cooling/condensation measurement technique used at NARA on July 23, 2001, and described in this paper to measure the water vapor content of the atmosphere in the hermetically sealed encasements containing the U. S. Constitution, the Declaration of Independence, and the Bill of Rights, proved to be a powerful new measurement technique. The cooling/condensation technique developed at NASA LaRC and utilized at NARA has important applications in the non-invasive measurement of relative humidity in the atmospheres of sealed encasements and could become a standard measurement technique in this type of analysis.
Document ID
20040086703
Document Type
Preprint (Draft being sent to journal)
Authors
Burkett, Cecil G. (NASA Langley Research Center Hampton, VA, United States)
West, James W. (NASA Langley Research Center Hampton, VA, United States)
Levine, Joel S. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 2004
Subject Category
Instrumentation and Photography
Meeting Information
2004 NCSL International Workshop and Symposium(Salt lake City, UT)
Funding Number(s)
OTHER: 23-72840-30
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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