Which line indicates where the heat is being absorbed by the refrigerant in refrigeration system?

In a refrigeration system, the line that indicates where heat is being absorbed by the refrigerant is the evaporator line. This line carries the refrigerant as it enters the evaporator coil, where it absorbs heat from the surrounding environment, causing the refrigerant to evaporate and transition from a liquid to a gas. This process cools the area being refrigerated, such as the interior of a refrigerator or air conditioning system.