Buoyancy and Archimedes' Principle
An object in a fluid experiences an upward buoyant force equal to the weight of displaced fluid. This explains floating, sinking, and apparent weight loss.
Archimedes' principle
The buoyant force equals ρfluid × Vdisplaced × g. If buoyancy exceeds the object's weight, it floats; otherwise it sinks.
Floating vs sinking
Average density determines fate: objects less dense than the fluid float with part of their volume submerged until displaced fluid matches their weight.
Explore buoyancy interactively
Place objects in a fluid zone, press Play, and read buoyant force and displacement live as density and volume change.