Consider a vertical piston/cylinder system. The piston has a mass of 35 kg and has an unknown radius. There is a pressure gauge to output the pressure inside the cylinder. If the piston is compressed and the pressure gauge reads 300 kPa. What is the area of the piston? ( Assume the piston is compressed as a result of its own weight when in actuality there would probably be an external force)
weight = 35 kg * 9.81 m/s^2
= area * pressure