During a high-altitude balloon flight, the atmospheric pressure at sea level is 102 kPa and the pressure at a height of 3000 m is 70 kPa.
Calculate the percentage decrease in pressure from sea level to the height of 3000 m. Give your answer to 3 significant figures.
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.