What is the typical humidity range for dry storage?

• A. 50–60%
• B. 10–20%
• C. 70–80%
• D. 0–10%

Answer: (A)

Humidity control in storage is about balancing the air moisture to prevent both moisture-related damage and drying-out issues. For dry storage, a middle-ground level around 50–60% relative humidity helps keep many types of goods stable: it minimizes mold, corrosion, and packaging swelling that come from excess moisture, while avoiding excessive dryness that can cause cracking, brittleness, or static in sensitive materials. If humidity were much lower, like 0–20%, hygroscopic items could dry out, become brittle, or build up static electricity. If it were much higher, around 70–80%, the risk of mold growth, rust, and damp packaging increases. So, 50–60% RH is a practical, widely used range because it reduces moisture-related risks without introducing the problems that come with too-dry or too-humid conditions.