Open Circuit Diver Gas management vs. Closed Circuit Divers Gas management
You are interested in understanding gasses and pressure and how an Open Circuit diver, compared to a Close Circuit diver manage their Partial Pressure of Oxygen, PPO. Fair enough. It’s quite simple actually. We will define an Open Circuit diver as a recreational diver using a single scuba tank, where a Closed Circuit diver is one using a rebreather.
If you are contemplating a rebreather course, no matter which Closed Circuit rebreather you choose, the principles you are about to learn are the same.
Before we move onto the subject of Closed Circuit, let us first review how the Partial Pressure of Oxygen,  PPO is managed by the Open Circuit diver and how pressure affects a gas as a diver ascends and descends as well as how the Open Circuit diver manages their gas, pressure and PPO.
Once you possess an understanding of …