Hi all I am working with glass micro pipettes. These pipettes have 1mm inside diameter in one end and 1micro meter at the other end. The pipette is filled with solution 1 and it is dipped to the solution 2. Both the solution has approximately the same surface tension. I have to pull out the solution from the 1 micron end by applying suction. Does any body know how much suction is necessary for pulling out the inside solution of the pipette? Thank you very much Majid