nonbuoyant

Nonbuoyant refers to an object or substance that does not float in a fluid, typically a liquid or gas. This occurs when the object's density is greater than the density of the fluid it is placed in. Density is defined as mass per unit volume. If an object is denser than the fluid, the upward buoyant force exerted by the fluid on the object is less than the downward force of gravity acting on the object. Consequently, the object sinks or remains at the bottom of the fluid.

The principle of buoyancy, often described by Archimedes' principle, states that an object submerged in a fluid is buoyed up by a force equal to the weight of the fluid displaced by the object. For an object to be nonbuoyant, the weight of the displaced fluid must be less than the object's own weight. For example, a rock is nonbuoyant in water because its density is higher than that of water, causing it to sink. Conversely, a piece of wood is buoyant because its density is lower than that of water, allowing it to float. In the context of gases, a heavy gas like sulfur hexafluoride is nonbuoyant in air, meaning it will sink relative to the surrounding air. Understanding buoyancy is crucial in various fields, including naval architecture, meteorology, and materials science.