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An isopiestic technique has been used for observing the static control of humidity by saturated salt solutions and by paired salt hydrates. Many new values within the range 7% to 60% relative humidity at 25°C have been obtained, using saturated solutions of highly soluble salts. Difficulties encountered in using paired salt hydrates to control humidity at low levels have been described.
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Richardson et al. (1955) studied this question.
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