🔍 Key Concepts

• Fractionation in refrigerant mixtures (what it means when different components boil/condense at different temperatures) • Difference between single-component refrigerants vs blends/mixtures • How azeotropic and zeotropic blends behave during phase change

💭 Think About

• Ask yourself: Does fractionation happen when all components act like a single substance, or when they boil off at different rates? • Which type of refrigerant has a temperature glide during evaporation/condensation, indicating changing composition in the vapor and liquid? • Eliminate any options that, by definition, are made of only one substance, and focus on those that are mixtures.

✅ Before You Answer

• Verify which refrigerant type has no temperature glide and behaves almost like a pure substance. • Confirm which refrigerant type can change its composition in the system as it evaporates and condenses (this is fractionation). • Make sure you understand that single-component refrigerants (organic or inorganic) do not fractionate because there are no separate components to separate.