Which principle tells us about the decrease in weight of a body when immersed in a liquid?
Archimedes law:
3. The weight owing to gravity being fought by the fluid's propulsion, as seen in the figure. The weight of the object inside the liquid is the sole force acting on it. Since this liquid's upthrust reduces the real gravitational pull, the item seems to be lighter.
Mathematically, Archimedes's law can be represented as:
Here,
Fb is the buoyant force.
ρ is the density of the fluid.
V is the submerged volume.
g is the acceleration due to gravity.
Therefore, Archimedes’ law explains that a buoyant force acts on an object immersed in the fluid.