The rise or float on the surface of water or within the atmosphere.

The rise or float on the surface of water or within the atmosphere.

• A. Glide ratio
• B. Buoyancy
• C. Stability
• D. Lapse rate

Answer: (B)

Buoyancy is the upward force that makes objects rise or float in a fluid, such as water or air. It comes from Archimedes’ principle: the fluid pushes back on a submerged or partially submerged object with a force equal to the weight of the fluid displaced. If the buoyant force is greater than the object's weight, it rises; if it’s less, it sinks; if they’re equal, it’s neutrally buoyant. This explains why ships float and why warm air parcels rise in the atmosphere, driving convection. The other terms don’t describe this upward force from displaced fluid—glide ratio relates to gliding performance, stability to how an aircraft resists disturbance, and lapse rate to how temperature changes with altitude.

Buoyancy is the upward force that makes objects rise or float in a fluid, such as water or air. It comes from Archimedes’ principle: the fluid pushes back on a submerged or partially submerged object with a force equal to the weight of the fluid displaced. If the buoyant force is greater than the object's weight, it rises; if it’s less, it sinks; if they’re equal, it’s neutrally buoyant. This explains why ships float and why warm air parcels rise in the atmosphere, driving convection. The other terms don’t describe this upward force from displaced fluid—glide ratio relates to gliding performance, stability to how an aircraft resists disturbance, and lapse rate to how temperature changes with altitude.