Question

What should be done to fill the medicin in the dropper?​

Answer 1

Answer:

Press the dropper cap to fill medicine inside as it would create a Vaccum inside when released back sucking the medicine inside.

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Answer 2

Answer:

When we squeeze the rubber top on the dropper we squeeze the air out. Then when we put the tip into the liquid and stop squeezing the top, the low pressure inside sucks up the liquid.

This works on the phenomenon of Air Pressure or Atmospheric Pressure.