Excerpt from Permeability of Membranes to Water Vapor, With Special Reference to Packaging Materials: Nbs Miscellaneous Publication 127 Comparative data from the various reports have been assembled in tables 1 and 2. The methods and testing conditions used are listed in table 1, while table 2 gives the results, expressed in a common unit for ready comparison, together with references to the sources of the data. The reference numbers in the tables and in the text correspond to the list of references at the end of the paper. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.