There has been constructed a thermal conductivity apparatus of the guarded hot plate type employing a compensatory heating unit and designed to test samples having low values of thermal conductivity. Tests on various types of loose-fill thermal insula· tors reveal that there is a linear increase of thermal conductivity with increased moisture content. Depending upon the particular type of sample under consideration, a hygroscopicity of 20 to 30 per cent by weight completely vitiates the efficacy of loose-fill jnsulation.
Proceedings of the Iowa Academy of Science
©1938 Iowa Academy of Science, Inc.
Stiles, H. and Ruff, H. E.
"Hygroscopicity as a Factor in the Thermal Conductivity of Loose-Fill Insulators,"
Proceedings of the Iowa Academy of Science, 45(1), 207-208.
Available at: https://scholarworks.uni.edu/pias/vol45/iss1/52