🔍 Key Concepts

• Flash evaporation and how pressure affects boiling point • Relationship between temperature, pressure, and vapor formation • Difference between heating coils with steam and simply lowering pressure

💭 Think About

• In a flash evaporator, does the liquid boil because it gets more heat, or because the surrounding pressure changes suddenly? • What happens to the boiling point of water when the pressure is reduced—does it go up or down? • Which option describes conditions where water can instantly turn to vapor without needing an additional heat source at that point?

✅ Before You Answer

• Identify which choices involve high vs. low pressure and recall which one promotes flash boiling. • Check which options use steam coils versus direct pressure change, and think: is flash evaporation primarily a heating process or a pressure-drop process? • Verify that the correct choice allows already-heated water to rapidly vaporize when entering a different pressure environment.