The moisture regain of viscose rayon in a saturated atmosphere has been estimated from measurements of the longitudinal swelling of the fiber at relative humidities ranging from dryness to saturation (water immersion). The density of viscose as a function of the regain has also been determined.
From these data, the volume swelling and the swelling of the cross-sectional area of the fiber have been calculated. The latter values, at the saturation regain deduced from the axial swelling measurements, are in substantial agreement with values which other investigators have determined by quite different methods of measurement.
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