Archimedes' principle states that the buoyant force on an object submerged in a fluid is equal to the weight of the fluid displaced by the object. The principle applies to objects of any shape and indicates that buoyancy reduces the apparent weight of fully submerged objects. Specifically, the apparent immersed weight of an object is equal to its actual weight minus the weight of the fluid it displaces.

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2. Archimedes principle indicates
that the upward bouyant force
that is exerted on a body
immersed in a fluid, whether fully
or partially submerged, is equal to
the weight of the fluid that the
body displaces. Archimedes'
principle is a law of physics
fundamental to fluid mechanies.
Archimedes Syeacuse formulated
this principle, which bears his
name.

3. The pressure difference between the bottom and the top face is directly proportional to
the height (difference in depth). Multiplying the pressure difference with the area of a
face gives the net force on the cube - the buoyancy, or the weight of the fluid
displaced. Whatever the shape of the submerged body, the buoyant force is equal to
the weight of the fluid displaced.
The weight of the displaced fluid is directly proportional to the volume of the displaced
fluid (if the surrounding fluid is of uniform density) the weight of the object in water is
less than the weight of object in air, because of the force acting on it which is called as
up-thrust. In simple terms, the principle states that the buoyant force on an object is
equal to the weight of the fluid displaced by the object, or the density of the fluid
multiplied by the submerged volume times the gravitational constant, g. Thus, among
completely submerged objects with equal masses, objects with greater volume have
greater buoyancy.
Suppose a rock's weight is measured as 10 Newton when suspended by a string in a
vacuum with gravity acting upon it. Suppose that when the rock is lowered into water,
it displaces water of weight 3 newtons. The force it then exerts on the string from
which it hangs would be 10 newtons minus the 3 newtons of buoyant force: 10 − 3 = 7
newtons. Buoyancy reduces the apparent weight of objects that have sunk completely
to the sea floor. It is generally easier to lift an object up through the water than it is to
pull it out of the water.
For a fully submerged object, Archimedes' principle can be reformulated as follows,
Apparent immersed weight = weight of object – weight of displaced fluid