Supply of an air flow with a continuously changing water activity from dry air (aw = 0) up to saturated vapour (aw = 1) has been applied for acting on powdered water active inorganic compounds placed on the sample panel of a DSC set kept at constant temperature. The absorption of water by the inorganic compounds was monitored by a scanning curve, similar to temperature or pressure induced phase transitions. DSH seems both rapid and inexpensive for monitoring the interaction with water vapour. Comparisons with DSC are discussed and the historical background of DSH is described.
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