Which of the following is a type of buoyancy that implies being lighter than water?

The correct answer indicates positive buoyancy, which refers to an object or individual that is lighter than the water surrounding them, causing them to float. This concept is fundamental in diving, where a diver may need to be positively buoyant when descending. A positively buoyant object experiences an upward force greater than its weight, allowing it to rise to the water's surface.

Neutral buoyancy, on the other hand, occurs when an object neither sinks nor floats; it maintains its position in the water column. Stable buoyancy is similar to neutral buoyancy, where an object achieves a state of balance in the water, though "stable" can refer to how well that position is maintained under various conditions. Negative buoyancy describes a state where an object is denser than water, resulting in it sinking. Understanding these buoyancy types is crucial for divers, as it plays a significant role in controlling ascent and descent during a dive.