🔍 Key Concepts

• Meaning of the term hygroscopic in basic chemistry/physics • How moisture affects refrigeration systems and compressor lubricants • Why refrigerant oil handling procedures often stress keeping containers tightly closed

💭 Think About

• Think about what happens if a lubricant inside a refrigeration system absorbs water—how would that affect system performance and safety? • Which of the options directly mentions a behavior related to water or moisture, not temperature or toxicity? • In your engineering studies, what other materials are described as hygroscopic, and what do they tend to do when exposed to air?

✅ Before You Answer

• Confirm the exact definition of hygroscopic (does it relate to water, temperature, or toxicity?). • Decide which choice clearly connects to absorbing or attracting moisture rather than other properties. • Ask yourself: which options could apply to many ordinary oils, and which one is uniquely tied to moisture handling and sealed storage?