The Boyle's Law – Mariotte provides an accurate quantitative result for the pressure/volume relationship of air at a constant temperature. A graduated cylinder with a close-fitting piston is connected to a pressure gauge by a narrow tube. Pressure inside the cylinder can be adjusted by rotating the knob connected to the piston. The gas tap allows the cylinder to communicate with the outside atmosphere to adjust the mass of air. The pressure can be read from the circular dial.
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