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Reference.org
Humidity buffering
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<p>Humidity buffering refers to the ability of materials to moderate changes in <a href="/facts/Relative_humidity/Nwb28VlT">relative humidity</a> by absorbing and desorbing water vapour from surrounding air. This is also referred to as moisture buffering. </p><p>The phenomenon has long been exploited for preserving items from damage that could be caused by either excessively moist or dry conditions. </p>