A tall beaker is filled with two liquids, Liquid X and Liquid Y, which do not mix. The density of Liquid X is 820 kg/m3820\text{ kg/m}^3820 kg/m3 and the density of Liquid Y is 1050 kg/m31050\text{ kg/m}^31050 kg/m3. A sensor measures the pressure due to the liquids at different depths, starting from the surface of the upper liquid down to the bottom of the beaker.
Identify which liquid is at the top of the beaker and explain why.
Describe how the gradient of the pressure-versus-depth graph changes as the sensor passes from the upper liquid into the lower liquid. Explain your answer using the relationship between hydrostatic pressure, density, and depth.
188 exam-style questions on CIE IGCSE Physics Pressure, covering Pressure. Each one has a worked solution and a mark scheme showing where the marks go.