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Dear student,
1.Buoyant force is the upward force exerted by liquid on object immersed in it.
and it is given as 
       Buoyant force = (Volume of body immersed) ∗ (density of liquid) ∗ (acceleration due to density)
2.Upward thrust is equivalent to mg
3.Since density of liquid is given as upthrust per unit volume. Hence, if density increases then up thrust also increases proportionally
4.Buoyant force in liquids helps in making objects appear lighter.

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