An underwater camera is tested at the same depth in an open-air diving pool on two different days. Its sensor measures total pressure, including atmospheric pressure. On the first day, the sensor reads 154 kPa when the atmospheric pressure is 101 kPa. On the second day, the sensor reads 149 kPa. The depth of the camera and the density of the water are unchanged. What is the atmospheric pressure on the second day?
96 kPa96\ \mathrm{kPa}96 kPa
149 kPa149\ \mathrm{kPa}149 kPa
101 kPa101\ \mathrm{kPa}101 kPa
53 kPa53\ \mathrm{kPa}53 kPa
132 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.