measure of a material's resistance to water vapor diffusion compared to that of a stagnant layer of air, calculated as the water vapor permeability of air divided by the water vapor permeability of the material in question
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APA4ort.xyz Knowledge Graph. (2026). Ekvivalent luftlagstykkelse. Retrieved May 7, 2026, from https://4ort.xyz/entity/q17769414
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