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An object floats when the upward buoyant force equals its weight. Buoyant force equals the weight of fluid displaced. If average density is less than the fluid’s density, it floats; if greater, it sinks.

A steel ship floats because its overall density (steel + air inside) is less than water’s, even though steel alone sinks.

Physics support in Khanna Islamabad can test small objects in a water bowl and predict float/sink from density, not from “heaviness” alone.