🔍 Key Concepts

• Flash-type evaporator operation and how seawater turns into vapor and then fresh water • Purpose of a demister in any steam/vapor system (what does the name suggest?) • Difference between removing gases (deaeration) and removing liquid droplets (entrainment)

💭 Think About

• Ask yourself: in a flash evaporator, what problem would occur if tiny seawater droplets stayed with the vapor instead of being removed? • Which answer choices talk about removing gases versus removing liquid water, and which function is more logically linked to the word "demister"? • Think through the sequence: seawater flashes to vapor → vapor passes through something → then condenses. At which point in this path would a demister do its job?

✅ Before You Answer

• Identify whether deaeration refers to removing dissolved gases or liquid droplets. • Decide what entrained water droplets are and how they affect the purity (salt content) of distillate. • Confirm which choice best describes removing liquid water from vapor before it condenses.