Which gas replaced helium as the choice to preserve historical documents?
#106131. Asked by Datsmeharse. (Jun 06 09 5:30 PM)
In the U.S. at least...
"Since 2001 the American National Archives stores important national documents such as the Declaration of Independence and the Constitution within argon-filled cases to retard their degradation. Using argon reduces gas leakage, compared with the helium used in the preceding five decades."
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