A doctor pushes the plunger of syringe down and then pulls it up to draw liquid into a syringe. why
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A doctor pushes the plunger of a syringe down and then pulls it up to draw liquid in to the syringe. When the doctor pushes the plunger of the syringe down it decreases the volume of fluid in the syringe and when he pulls it up the volume of the fluid increases causing the liquid to move into the syringe
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