.
A number of factors can affect the outcome of decompression and its influence of cabin occupants: the size of the cabin - the bigger the cabin, the longer the decompression time, the impairment of the airplane structure: the bigger the opening, the quicker the decompression time, and the pressure differential: the greater the pressure differential between the cabin pressure and the outer environment pressure, the more likely it will decompress forcefully (Airbus).
Explosive Decompression.
This decompression is very violent, resulting from an unexpected loss in cabin pressure. This type of decompression can be identified by the following signs, a rush of air; as air escapes the cabin, a loud thump or bang that results from rapid contact between the interior and exterior masses of air, and in most modern airplanes, when the cabin altitude exceeds 14,000 feet, the cabin oxygen masks discharge. Rapid compression is another type of uncontrolled decompression that is very similar to explosive decompression.
Slow Decompression.
Another type of uncontrolled decompression is slow decompression, also known as gradual decompression. This type of decompression happens so slowly that one will not feel it unless hypoxia starts. Slow decompression may not always be noticeable. Slow decompression can be caused by a faulty door seal, a failure in the pressurization system or a simple cracked window. The crew member sometimes does not notice the change in the cabin, until the oxygen masks drop down from the Passenger Service Units (PSUs). That is why it is very important that cabin crew be aware of signs that could signify slow decompression. Some warnings of physiological signs of slow decompression may be joint or stomach pain as a result of gas expansion, or ear discomfort (Damski, 1996).
Hypoxia.
Hypoxia is lack of adequate oxygen in the body's metabolism (Reinhart, 2008), one of the greatest threats during decompression.