Two identical deep-sea submersible hulls, Hull A and Hull B, are exploring the ocean. Hull A is operating at a depth of 3.5 km3.5\text{ km}3.5 km below the surface, while Hull B is operating at a depth of 8.0 km8.0\text{ km}8.0 km below the surface. Both hulls have an identical flat quartz observation window.
Explain, with reference to hydrostatic pressure, why the compressive force exerted by the seawater on the window of Hull B is more than twice the compressive force exerted on the window of Hull A.
54 exam-style questions on Edexcel GCSE Physics 15.2 Pressure in fluids, covering 15.2.1 Atmospheric pressure and height, 15.2.2 Pressure in fluids, 15.2.3 Pressure, force and area, 15.2.4 Pressure and depth, 15.2.5 Pressure in liquids: depth and density, 15.2.6 Upthrust, and 15.2.7 Floating and sinking. Each one has a worked solution and a mark scheme showing where the marks go.