- Humidity buffering
Humidity buffering refers to the ability of materials to moderate changes in
relative humidityby absorbing and desorbing water vapour from surrounding air. This is also referred to as moisture buffering.
The phenomenon has long been exploited for preserving items from damage that could be caused by either excessively moist or dry conditions.
Cigarsare usually kept in a wooden box called a humidor. A pan of water is placed in the humidorso that the wood will absorb water vapor at close to 100% Relative Humidity. It is then used to store the cigarsat fairly constant relative humidty, between 45-50%.
Silica Gelis widely used in the opposite way, as a desiccantto buffer relative humidity inside museum display cases, packaged clothing, electronics and anything that might be damaged by condensation.
Recently, there has been an interest in the field of
building scienceand architecturein using humidity buffering as a passive indoor climate control, thus reducing the need for air conditioningand ventilation.
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