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The rate and extent of both physical and chemical processes can be monitored at elevated humidity by placing a saturated salt solution in the calorimeter cell with the sample.  Here the results showed that a suspected hydrate impurity formed more rapidly at smaller particle sizes.  However, since the three samples had the same total heat generated the extent of formation was not dependent upon particle size (and therefore the entire particles, not just the surfaces formed the hydrate).

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Data collected using Setaram microDSC