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 (physics only). Each one has a worked solution and a mark scheme showing where the marks go.