رطوبة نسبية
Inaproppriate relative humidity effects a wide range of object materials and storage solutions. Relative humidity is the quality of the air that ranges between damp and dry, which causes damage to objects. Damp is when the relative humidity is over 75%. Damp causes several types of deterioration: mold, rapid corrosion, and extreme forms of mechanical damage. Mold damages any form of organic material.