The given apparatus shows a heavy piston supported by gas trapped in a cylinder. The cross-sectional area of the piston is 4.0×10−4m2. The pressure of the gas inside the cylinder is 1.5×105
Pistons-cylindres – Laboratoire Magmas et Volcans
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Piston Cylinder works D.90 mm 9794DB - Pièces Moteur sur La Bécanerie