What are the factors Affecting Buoyant Force ?

                           
                               Buoyancy
The tendency of a liquid to exert an upward force on an  object place in it, is called buoyancy. In general, whenever an object (or body) is immersed in water (or any other liquid),it appears to lose some weight and feels lighter.
                        Buoyant Force
When in object is immersed in a liquid, it experiences an upward force.This upward force is called buoyant force. Thus, the upward force acting on an object immersed in a liquid is called buoyant force. It is due to the upward 'buoyant force' exerted by a liquid that the weight of an object appears to be less in the liquid than its actual weight in the air.
                 Causes of Buoyant Force
In order to understand why liquids exert an upward buoyant force, let us consider a mug filled with water immersed in a bucket containing water as shown on above figure. Water exerts force on the sides of the mug as well as on its top and bottom (shown by arrows). The sideways forces exerted by water on the mug, being equal and opposite, cancel out. Now, there is a force of water acting on the top of the mug (which acts in the downward direction), and a force of water acting on the bottom of the mug (which acts in the upward direction) in the above figure. It is known that the pressure exerted by a liquid increases with depth and acts in all direction (even upward)
            Factors affecting Buoyant Force
The magnitudes of Buoyant force acting on an object immerged in a liquid depends on two factors :
 1. Volume of object immersed in the liquid, and 
2. Density of the liquid.

                ARCHIMEDES'  PRINCIPLE 
When a solid object is immerged (or dipped) in a liquid, an upward 'buoyant force' acts on the object. The magnitude of this buoyant force is given by Archimedes' principle. According to Archimedes' principle :  When an object is wholly (or partially) immersed in a liquid, it experiences a buoyant force (or upthrust) which is equal to the weight of liquid displaced by the object. In other words : 

  Buoyant force  = Weight of liquid displaced 
 acting on an object               by that object 
For example, if a stone, on being immersed in water, displaced 10 newtons, weight of water, then according to Archimedes principle, the buoyant force acting on the stone will be equal to 10 newtons. Thus, the magnitude of buoyant force acting on an object immersed in a liquid is equal to the weight of liquid displaced by the immersed object.
   
I am Saheb Sarkar from purnea .

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