difference of suspended slab and non suspended slab
Concrete slab In many domestic and industrial buildings a thick concrete slab, supported on foundations or directly on the subsoil, is used to construct the ground floor of a building. These can either be "ground-bearing" or "suspended" slabs. The slab is "ground-bearing" if it rests directly on the foundation, otherwise the slab is "suspended".[3]  For double-storey or multi-storey buildings, the use of a few common types of concrete suspended slabs are used (for more types refer to the Concrete Slab#Design section below):
Vertical pressure variation A relatively simple version [1] of the vertical fluid pressure variation is simply that the pressure difference between two elevations is the product of elevation change, gravity, and density. The equation is as follows: