Archimedes' Principle states that any body completely or partially submerged in a fluid experiences an upward buoyant force ($F_b$).

• The magnitude of this force is exactly equal to the weight of the fluid displaced by the body. $F_b=V_{submerged}\cdot {\rho }_{fluid}\cdot g$
• If $F_b>W_{object}$, the object floats.
• If $F_b<W_{object}$, the object sinks.