Principles of the conversion of a measured electrical signal t o the relative humidity units have been worked out according t o a theory of the method and the measuring system for water vapour permeability through packaging films measurement. The method and the system were based on sorptive sensor reaction inertia analysis. The constants of the measuring vessel were determined by means of the dish method for fixed measurement conditions. Using the developed theory, water vapour permeability was determined for the chosen films. The results obtained were in close agreement with values determined by the dish method and additionally for PET-50 film also in close agreement w i t h the literature data. The uncertainty of the results obtained by this method was estimated. The relative mean uncertainty (a = 0.05) was B, 2 1.1% and the relative maximum uncertainty o f a single result Keywords: water vapour permeability; transient permeation; sensor inertia Bpmax = 3.1%.

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This paper proposes a model showing how response self-relevance shapes the use of abstract product attributes in the consumer response (i.e., evaluation and choice) to a set of product alternatives perceived directly (i.e., with no accompanying verbal message). The related existing literature scarcely studied the above relationship, focusing instead on consumer response to a verbal message about a single product alternative. The model developed in this paper is examined in multi-stage research, including the main survey on product evaluation and choice, and a preliminary study, using Exploratory Factor Analysis to identify the structure of direct product perception. The results suggest that, for the high self-relevance response (i.e., choosing alternatives for own usage), consumers who process more analytically respond more consistently with the evaluation of abstract attributes. On the other hand, for the low self-relevance response (i.e., mere evaluation of product alternatives), consumers who process more analytically respond more consistently with the evaluation of attributes perceived as important. This paper extends the current views on the relationship between self-relevance and the use of abstract attributes into the domain of the consumer direct response to a set of product alternatives. The findings may support managers in allocating their focus on product attributes between the abstract ones and those perceived as important.

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