Abstract
The steady state experiments for the effective thermal conductivity of papers were carried out at and below atmospheric pressure.The thermal conductivity of porous materials below 0.05mmHg is considered to be the value of the materials.Results obtained were as follows.(1) 10% of the effective thermal conductivity depends on papers. and 90% the content of air.(2) The relation ship between the thermal conductivity and density of papers is not decisive below atmospheric pressure.(3) The effective thermal conductivity at atmospheric pressure and density show the same gradient of linear relation ship as Mr.Wakasugi's Experimental Formular, but the value is about 13% higher than measured values. (λ20=0.035+0.00015P)
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