Experts please explain the following ...

Dear Student,

​​​​​Archimedes principle states that when a body is immersed wholly or partially in a liquid, it experiences an upward buoyant force of magnitude equal to the weight of the liquid displaced by it. 
Buoyant force = Weight of displaced liquid 
Weight of displaced liquid = Mass of the displaced liquid × Acceleration due to gravity 
= Density of the liquid × Volume of the displaced liquid × Acceleration due to gravity 
∴Volume of the displaced liquid = Volume of the object that is immersed in the liquid 
∴Weight of the displaced liquid = Volume of the object immersed in the liquid × Density of the liquid × Acceleration due to gravity 
Hence, we can write the magnitude of the upthrust on an object that is immersed in a liquid as Buoyant force = Volume of the object × Density of the liquid × Acceleration due to gravity

Since buoyant force depends on the density of the liquid in which it is immersed, it is different in different liquids for the same object.


The law of floatation explains that, "A floating body displaces its own weight of the fluid in which it floats".
​​​​​As the object is displacing liquid of weight equal to its own, the upward force is equal to downward force so the object floats.
Any floating body uses this principle. The best example of law of floatation is floating ships.
Here is an application with explanation following law of flotation
A ship floats because it sinks into the water until it has displaced is equal to its own weight of water. A ship is shaped to displace its own weight of water before it reaches the point where it will submerge.


Regards,