A 20 cm thick concrete slab rests on the floor. How much pressure the concrete slab produces on the floor.

We know the following formulas: P = F: S; F = mg; m = pV; V = Sh
1) Using the above formulas, we express: P = F: S = (mg): S = (pVg): S = (pgSh): S = pgh
2) Knowing all the known values, we substitute it into the derived formula and calculate: P = 2.35 g / cm3 * 20 cm * 10 m / s2 = 47 g / cm2 * 10 m / s2 = 0.000047 kg / m2 * 10 m / s2 = 0.47 mPa