What does hygroscopic mean?

• A. A substance that reacts with air
• B. A substance that repels moisture
• C. A substance that readily absorbs moisture from air
• D. A type of hazardous chemical reaction

Answer: (C)

Hygroscopic refers to a substance's ability to readily absorb moisture from the surrounding air. This means that hygroscopic materials can attract and hold water vapor, leading to changes in their physical properties. In many cases, hygroscopic substances can influence the surrounding environment, such as affecting humidity levels or contributing to corrosion in certain materials. This characteristic is significant in various applications, including the handling and storage of chemicals, food products, and pharmaceuticals, where maintaining proper moisture levels is crucial. Understanding this term is essential for hazardous materials responders, as they may encounter hygroscopic substances that require special handling to prevent unintended reactions or degradation.