I have a homemade, non-bulb pipette, 66 cm long. When shut, fluid does not escape. Is there a universal formula for this effect? Surface tension, adhesion, gravity, air pressure?
Md Ariful Islam
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Dr. Md Rushad Rahman
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If the fluid in the pipette's exit flowed out, it would create a near vacuum, sucking the liquid back in. No gas can replace the liquid, so the only gas available attempts to fill the space. This creates the sucking force (like the principle of the vacuum cleaner) that keeps the liquid in place.
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