A rapid decompression occurs in less than how many seconds?

A rapid decompression is typically characterized as occurring in less than 4 seconds. This definition is important in aerospace physiology because a rapid decompression can lead to a sudden loss of cabin pressure, which can have serious physiological effects on passengers and crew.

In this timeframe, the rapid change in pressure can lead to two key issues: the risk of hypoxia (lack of adequate oxygen) and the potential for barotrauma, particularly for the lungs and middle ear. Understanding this timeframe helps aviators and crew prepare for emergency scenarios, ensuring they can execute appropriate safety protocols quickly.

This distinction highlights the urgency and severity of rapid decompression compared to slower decompression events, which may allow more time for the body to acclimatize or for emergency procedures to be implemented.