What happens to cabin pressure as an aircraft climbs?

As an aircraft climbs, the cabin pressure decreases gradually. This is due to the fact that as altitude increases, the ambient air pressure outside the aircraft decreases. In order to maintain passenger comfort and ensure that the aircraft structure can withstand the pressure differential, the cabin pressure is controlled and managed by the aircraft's pressurization system.

During ascent, the cabin is pressurized to a level suitable for passenger comfort, typically equivalent to an altitude of around 6,000 to 8,000 feet, even when the aircraft is much higher in the atmosphere. As the aircraft climbs, the pressure in the cabin is adjusted to prevent a rapid change that could be uncomfortable or harmful to passengers, hence the gradual decrease. Therefore, it is essential for a well-functioning pressurization system to ensure a smooth transition as the aircraft ascends, ultimately keeping cabin pressure at a safe and comfortable level despite the outside conditions.