ocr: PISTON CHAMBER gtl - - L4 - - PISION. NOZZLE TTTLL FLUID MOLECULES When the piston moves inward, the volume of the chamber decreases,sO the pressure inside increases. The Auid theretore travels to the lower-pressure air outside. Pulling the piston reduces the pressure in the chamber to below that of the air outside. Air - is then sucked linto the chamber.
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