What is one material defect of rapid decompression?

Rapid decompression is a scenario where the cabin pressure of an aircraft drops suddenly and significantly, leading to several material effects in the cabin environment. Each of the listed choices represents a consequence of this phenomenon.

When a rapid decompression occurs, oxygen masks are deployed automatically to provide passengers with supplemental oxygen, which is crucial at higher altitudes where the air is thin and cannot support adequate breathing. Therefore, the dropping of the oxygen masks is a direct response to the need for oxygen in low-pressure environments.

Additionally, rapid decompression can generate a significant drop in air pressure that can cause lighter objects, such as papers, to float or be blown around in the cabin. This is a physical reaction to the change in pressure and is observed during such events.

Lastly, the boiling point of liquids decreases with a reduction in atmospheric pressure. Thus, if hot liquids are present in the cabin during rapid decompression, they can begin to boil as the pressure drops, even at temperatures below their normal boiling point at ground level.

Given these considerations, all the options accurately describe the material defects resulting from rapid decompression, making the answer comprehensive in covering the effects of this situation.