It defines that when an object is immersed partly or completely in a liquid, it loses in weight same to the weight of the liquid displaced by it.

Let w₁ be weight of an object in air and w₂ be the weight, when completely immersed in a liquid.

Loss in weight of the object inside the liquid = w₁ - w₂

When the body is immersed in the liquid, it seems upthrust. The upthrust is similar to the weight of the liquid displaced by the object. Since the upthrust performs upwards, the weight of the object under the liquid decreases apparently by an amount same to the weight of the unplaced liquid. Hence,

            = weight of the liquid unplaced by the object

Relation between density of liquid and solid: weight of the floating solid = weight of the liquid displaced

or        

This relationship is valid in gaining fluid also.

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