During a robotic probe exploration of the Venusian atmosphere, the atmospheric pressure at an altitude of 12 km is recorded as 42.5 bar42.5\text{ bar}42.5 bar, and the pressure at an altitude of 25 km is 15.8 bar15.8\text{ bar}15.8 bar.
Calculate the percentage decrease in atmospheric pressure from 12 km to 25 km altitude. 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.