With the air supply on, how does the air pressure inside an enclosed lifeboat compare to outside air pressure?

In an enclosed lifeboat with the air supply on, the air pressure inside the lifeboat is greater than the outside air pressure. This situation arises because the air supply system is designed to maintain a constant flow of fresh air into the lifeboat, which increases the internal pressure.

When air is supplied, it can create an overpressure condition due to the volume of air being introduced into the confined space of the lifeboat. This is essential for ensuring adequate ventilation and breathable conditions for the occupants. Maintaining a higher pressure inside the lifeboat helps to prevent the ingress of potentially harmful external elements, such as water or gases.

This increased pressure is particularly important in survival situations, where proper air quality and pressure can affect the well-being of those on board. It also helps to avoid any risk of flooding as long as the lifeboat remains functioning well and the air supply is maintained.

While external conditions, such as altitude and weather, can affect outside air pressure, in a controlled environment like a lifeboat with an active air supply, the internal pressure will consistently be greater than the external pressure, helping to create a safe and secure environment for survivors.