Syringe is a device to inject liquid medicine into body and take out blood from body. It consists of a cylinder fitted with air tight piston.
Working of a syringe: When piston is pushed, the air inside barrel is blown out. After that the nozzle or associated needle is dipped into liquid or blood. When the piston is pulled back the fluid is inserted into the barrel due to the creation of vacuum inside it. Inside barrel there is low pressure and outside of barrel there is high pressure.
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