What Are the Physics Behind Drawing Up Medication in a Syringe?

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SUMMARY

The discussion centers on the physics involved in drawing medication into a syringe, emphasizing the importance of air displacement. When inserting the needle into a medication vial, air must be pushed into the vial to prevent the formation of a partial vacuum, which would hinder the withdrawal of the liquid medication. The pressure differential in the syringe will not exceed 14.7 psi at sea level, illustrating the limitations of atmospheric pressure in this process. Understanding these principles is crucial for efficient medication administration.

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tillitea
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Can someone discuss the physics behind pulling air into a syringe, inserting needle into med vial, expelling the air, and finally drawing up medication. This process makes it easier to draw up the liquid med as opposed to simply inserting needing and drawing up med. Thank you.
 
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It provides a volume of air to replace the volume of liquid being withdrawn from the med vial. Without this, the withdrawal of the medical would be producing a partial vacuum in the vial.
 
Air is never pulled into the syringe, only pushed in. Air goes from higher concentration to the void you are creating inside the syringe.

If you put a vacuum gage on the syringe,(no matter how long the syringe was), The pressure differential would never exceed 14.7psi.(Sea Level)
 
Last edited:
Yes, it is just a bit hard to corral those molecules and drag them in. You just have to let them follow at their own pace. Just like herding cats!
 

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