In a piping system, where does air tend to accumulate?

Air tends to accumulate in the highest part of a piping system due to its lower density compared to liquids like refrigerant or water. When the system is filled with a fluid, any air that is present will rise to the top and form pockets because it is lighter. This accumulation can lead to issues such as reduced efficiency of the system, interrupted fluid flow, and potential damage to components if not removed. Proper design and maintenance of piping systems often include air vents or bleed valves at high points to allow trapped air to escape, ensuring optimal operation and preventing disruptions.