Pressure is force per unit area, p = F/A; fluids exert pressure normal to surfaces. Higher-tier liquid pressure increases with depth and density: p = hρg is the pressure due to the liquid column. A greater pressure below an immersed object than above creates upthrust. It floats in equilibrium when upthrust equals weight; sinking occurs when weight exceeds upthrust. Example: A 240 N force acts normally over 0.06 m². Calculate pressure. p = F/A = 240/0.06 = 4000 Pa. Use clear labels. Use evidence.