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.
(.png)
