🔍 Key Concepts

• purpose of a salinity indicator in a steam plant or evaporator system • difference between detecting presence/amount of salt and analyzing overall water chemistry • how engineers locate leaks between saltwater and freshwater systems

💭 Think About

• Is a salinity indicator designed to give a full chemical breakdown of the water, or a specific measurement related mainly to dissolved salts? • Think about what problem a salinity indicator helps you catch early in a boiler or distilling plant: is it about how much salt is in the water, or exactly where the salt is getting in? • Which answer choice describes something you could reasonably know from just measuring salinity (parts per million of salt), without doing more detailed lab tests or inspections?

✅ Before You Answer

• Identify which options describe measuring a quantity versus diagnosing a cause. • Ask: can a single reading of salinity directly tell you the exact source or cause of contamination? • Focus on the answer that best matches a simple instrument that measures salt content, not a full chemical analysis tool.