Would a Syringe in Space Create a Void Without Resistance?

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SUMMARY

The discussion centers on the behavior of a syringe in outer space compared to Earth, specifically regarding the resistance felt when pulling back the plunger. When the plunger is pulled back on Earth with a finger over the tip, atmospheric pressure creates resistance due to the void formed inside the syringe. In outer space, without atmospheric pressure, the absence of air means that while a void is created, there is no external pressure acting against the plunger, resulting in no resistance felt when pulling back. This highlights the significant role of atmospheric pressure in fluid dynamics.

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pr0230
First Question on this forum, here goes...

IF you have a large syringe(no needle), and put your finger over the tip of the syringe, then pull back on the plunger, you will feel a resistance on the plunger due to the VIOD your are trying to create. In essence there is NOTHING in the void...
SO, If you do the same thing, BUT are in outer space, would you feel the same resistance?
While in outer space you left your finger OFF of the tip of the syringe and pulled back, would there be resistance, since essentially in either case there would be a VIOD in the syringe?
 
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Draw a free body diagram on the plunger for the two situations, and, for the Earth bound syringe, don't forget to include the force of atmospheric pressure on the plunger.

Chet
 

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