This saturation humidity can be anywhere from 5% to 70% humidity, depending on which salt. If a hygroscopic salt is in an enclosed chamber, the chamber dries out to some low percentage relative humidity.
www.newton.dep.anl.gov/askasci/gen06/gen06245.htm
Salt is hygroscopic, meaning it absorbs water from the air. This water dissolves the salt, and the resulting salt water combines with the remaining salt, cementing the grains together into a solid mass. Calcium silicate absorbs moisture from the air better than salt, and does not dissolve in the water it absorbs.
sci-toys.com/ingredients/table_salt.html sci-toys.com/ingredients/table_salt.html
An example of a hygroscopic salt would be calcium chloride, a salt that absorbs water from the atmosphere to form a saturated solution
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United States Patent 2319667 ... Edmunds, Alvin M. ... Download PDF 2319667 PDF help...
www.freepatentsonline.com/2319667.html
United States Patent 2394758 ... Edmunds, Alvin M. ... Download PDF 2394758 PDF help...
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Jul 17, 2009 ... introducing or removing a hygroscopic salt in the surface layer of ..... hygroscopic salt ink will leave a mark on the photonic paper, ...
doi.wiley.com/10.1002/adma.200901562
Structure and Properties of Hygroscopic PA6–Inorganic Salt Blend ... Blends of nylon-6 and inorganic salt (composition range 0–10% by weight) were prepared by melt processing at 230 C, forming an intimate blend of the two components. The structure of the blend was investigated by using FTIR and WAXD techniques.
jep.sagepub.com/cgi/content/short/36/3/241
GROWTH OF SOME HYGROSCOPIC SALT AEROSOLS IN. STANDARD CONDITIONS. P. Pasanen, K. Koistinen, T. Raunemaa. University of Kuopio, Department of Environmental ...
www.springerlink.com/index/7104g75661812wp2.pdf
Effects of hygroscopic salt contamination on moisture content ... Perhaps its greatest use is identfying the performance of remedial damp-proof courses, and giving a definitive evaluation of hygroscopic ('salt damp') moisture problems.
www.buildingpreservation.com/Moisture%20and%20salts.htm www.buildingpreservation.com/Moisture%20and%20salts.htm