Szukana fraza: [Abstract = "The results showed that a parameter representing hydraulic losses of the mask material has a significant influence on the concentration of carbon dioxide in the inner space of the mask. Masks with higher hydraulic resistances accumulated a higher concentration of carbon dioxide, and generated greater fluctuations of carbon dioxide as a function of time, which may be caused by compensation of the respiratory system. For example, in a two\-layer mask \(mask no. 3\) the hydraulic resistance values are about three times higher than in a single\-layer mask \(mask no. 1\)."]

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