What is the duration threshold for explosive decompression?

Explosive decompression occurs when a sudden reduction in pressure happens in a very short time frame, typically measured in milliseconds. The threshold for what is classified as explosive decompression is generally recognized as any event that takes place shorter than 1 second. This brief duration is critical because it allows for the rapid expansion of gases within the body and a potential for severe physiological effects. When the decompression happens rapidly, it can lead to over-expansion of gases in tissues, leading to a variety of life-threatening conditions. Therefore, the correct answer highlights that explosive decompression is characterized by this very quick occurrence, which is crucial for understanding the risks associated with rapid altitude changes in aviation or diving scenarios.